diff --git a/CMakeLists.txt b/CMakeLists.txt
index 672e766..fae6aec 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -117,12 +117,30 @@ endif()
 
 add_subdirectory(Bootstrap)
 add_subdirectory(Common)
+
+add_library(UpdateClientUpdaterLogic STATIC
+    Updater/UpdaterLogic.h
+    Updater/UpdaterLogic.cpp
+)
+target_compile_features(UpdateClientUpdaterLogic PUBLIC cxx_std_17)
+target_include_directories(UpdateClientUpdaterLogic PUBLIC
+    "${CMAKE_CURRENT_SOURCE_DIR}/Updater"
+)
+target_link_libraries(UpdateClientUpdaterLogic
+    PUBLIC
+        Common
+        Qt5::Core
+        Qt5::Network
+        Qt5::Gui
+        Qt5::Widgets
+)
+
 add_subdirectory(Launcher)
 add_subdirectory(Updater)
 add_subdirectory(MainApp)
 
 foreach(_update_client_primary_target IN ITEMS
-        Bootstrap Common Launcher Updater MainApp)
+        Bootstrap Common UpdateClientUpdaterLogic Launcher Updater MainApp)
     add_dependencies("${_update_client_primary_target}" UpdateClientNoHanCheck)
 endforeach()
 
diff --git a/Common/CMakeLists.txt b/Common/CMakeLists.txt
index 0e510a6..8f97862 100644
--- a/Common/CMakeLists.txt
+++ b/Common/CMakeLists.txt
@@ -5,6 +5,8 @@ set(_common_sources
     FileHelper.cpp
     ConfigHelper.h
     ConfigHelper.cpp
+    InitialStatePolicy.h
+    ManifestBootstrapPolicy.h
     PolicyHelper.h
     PolicyHelper.cpp
     LocalStateHelper.h
diff --git a/Common/ConfigHelper.cpp b/Common/ConfigHelper.cpp
index 4a7486e..e289f9b 100644
--- a/Common/ConfigHelper.cpp
+++ b/Common/ConfigHelper.cpp
@@ -1,4 +1,5 @@
 #include "ConfigHelper.h"
+#include "InitialStatePolicy.h"
 
 #include <QCoreApplication>
 #include <QDebug>
@@ -583,9 +584,20 @@ bool ConfigHelper::initializeStateDefaults()
 
     for (const QString& key : mutableKeys())
     {
+        if (!m_initialState.contains(key))
+            continue;
+
         const QString storageKey = stateStorageKey(key);
-        if (!settings.contains(storageKey) && m_initialState.contains(key))
-            settings.setValue(storageKey, m_initialState.value(key).toString());
+        const bool storedValueExists = settings.contains(storageKey);
+        const QString storedValue = storedValueExists
+            ? settings.value(storageKey).toString()
+            : QString();
+        const QString initialValue = m_initialState.value(key).toString();
+        if (UpdateClient::shouldApplyInitialStateValue(
+                key, storedValueExists, storedValue, initialValue))
+        {
+            settings.setValue(storageKey, initialValue);
+        }
     }
 
     settings.sync();
diff --git a/Common/InitialStatePolicy.h b/Common/InitialStatePolicy.h
new file mode 100644
index 0000000..d291192
--- /dev/null
+++ b/Common/InitialStatePolicy.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include <QString>
+
+namespace UpdateClient
+{
+inline bool shouldApplyInitialStateValue(const QString& key,
+                                         bool storedValueExists,
+                                         const QString& storedValue,
+                                         const QString& initialValue)
+{
+    if (!storedValueExists)
+        return true;
+
+    return key == QStringLiteral("license_key")
+        && storedValue.trimmed().isEmpty()
+        && !initialValue.trimmed().isEmpty();
+}
+}
diff --git a/Common/IntegrityHelper.cpp b/Common/IntegrityHelper.cpp
index e6b63a1..9abbf16 100644
--- a/Common/IntegrityHelper.cpp
+++ b/Common/IntegrityHelper.cpp
@@ -19,6 +19,11 @@ IntegrityHelper::IntegrityHelper(const QString& installDir)
 
 QString IntegrityHelper::errorString() const { return m_error; }
 
+bool IntegrityHelper::isManifestCacheMissing() const
+{
+    return m_manifestCacheMissing;
+}
+
 bool IntegrityHelper::safeRelativePath(const QString& path) const
 {
     const QString clean = QDir::cleanPath(QDir::fromNativeSeparators(path));
@@ -82,14 +87,20 @@ bool IntegrityHelper::verifyInstalledVersion(const QString& appId, const QString
                                              const QString& version)
 {
     m_error.clear();
+    m_manifestCacheMissing = false;
     QString cachePath = QDir(ConfigHelper::instance().updateRoot()).filePath(
         "manifest_cache/manifest_" + version + ".json");
     const QString legacyCachePath = QDir(m_installDir).filePath(
         "update/manifest_cache/manifest_" + version + ".json");
     if (!QFile::exists(cachePath))
         cachePath = legacyCachePath;
+    if (!QFile::exists(cachePath)) {
+        m_manifestCacheMissing = true;
+        m_error = "signed manifest cache missing for " + version;
+        return false;
+    }
     QFile cache(cachePath);
-    if (!cache.open(QIODevice::ReadOnly)) { m_error = "signed manifest cache missing for " + version; return false; }
+    if (!cache.open(QIODevice::ReadOnly)) { m_error = "cannot read signed manifest cache for " + version; return false; }
     QJsonParseError wrapperError;
     const QJsonDocument wrapperDoc = QJsonDocument::fromJson(cache.readAll(), &wrapperError);
     if (wrapperError.error != QJsonParseError::NoError || !wrapperDoc.isObject()) {
diff --git a/Common/IntegrityHelper.h b/Common/IntegrityHelper.h
index 202bfc7..4e407b1 100644
--- a/Common/IntegrityHelper.h
+++ b/Common/IntegrityHelper.h
@@ -7,6 +7,7 @@ public:
     explicit IntegrityHelper(const QString& installDir);
     bool verifyInstalledVersion(const QString& appId, const QString& channel,
                                 const QString& version);
+    bool isManifestCacheMissing() const;
     QString errorString() const;
 
 private:
@@ -17,4 +18,5 @@ private:
 
     QString m_installDir;
     QString m_error;
+    bool m_manifestCacheMissing = false;
 };
diff --git a/Common/ManifestBootstrapPolicy.h b/Common/ManifestBootstrapPolicy.h
new file mode 100644
index 0000000..26ac2ef
--- /dev/null
+++ b/Common/ManifestBootstrapPolicy.h
@@ -0,0 +1,24 @@
+#pragma once
+
+namespace UpdateClient
+{
+enum class ManifestBootstrapAction
+{
+    None,
+    FetchCurrentManifest,
+    CurrentVersionNotPublished
+};
+
+inline ManifestBootstrapAction manifestBootstrapAction(
+    bool manifestCacheMissing,
+    bool networkAvailable,
+    bool updateAvailable,
+    int serverVersionId)
+{
+    if (!manifestCacheMissing || !networkAvailable || updateAvailable)
+        return ManifestBootstrapAction::None;
+    if (serverVersionId <= 0)
+        return ManifestBootstrapAction::CurrentVersionNotPublished;
+    return ManifestBootstrapAction::FetchCurrentManifest;
+}
+}
diff --git a/Launcher/CMakeLists.txt b/Launcher/CMakeLists.txt
index 1ed43b9..dd532dd 100644
--- a/Launcher/CMakeLists.txt
+++ b/Launcher/CMakeLists.txt
@@ -17,6 +17,7 @@ target_compile_features(Launcher PRIVATE cxx_std_17)
 target_link_libraries(Launcher
     PRIVATE
         Common
+        UpdateClientUpdaterLogic
         Qt5::Core
         Qt5::Network
         Qt5::Gui
diff --git a/Launcher/main.cpp b/Launcher/main.cpp
index 7ec5f72..db746ef 100644
--- a/Launcher/main.cpp
+++ b/Launcher/main.cpp
@@ -12,7 +12,9 @@
 #include "../Common/TicketHelper.h"
 #include "../Common/DeviceIdentityHelper.h"
 #include "../Common/IntegrityHelper.h"
+#include "../Common/ManifestBootstrapPolicy.h"
 #include "../Common/TranslationHelper.h"
+#include "../Updater/UpdaterLogic.h"
 #include <QFile>
 #include <QFileDialog>
 #include <QDir>
@@ -198,7 +200,47 @@ int main(int argc, char *argv[])
     const QString mainAppPath = QDir(appDir).filePath(mainExecutable);
     const QString updaterPath = QDir(appDir).filePath(updaterExecutable);
     IntegrityHelper integrity(config.installRoot());
-    if (!integrity.verifyInstalledVersion(appId, channel, currentVersion))
+    bool integrityVerified = integrity.verifyInstalledVersion(
+        appId, channel, currentVersion);
+    QString integrityError = integrity.errorString();
+    const UpdateClient::ManifestBootstrapAction bootstrapAction =
+        UpdateClient::manifestBootstrapAction(
+            integrity.isManifestCacheMissing(), networkOk, needUpdate,
+            targetVersionId);
+    if (!integrityVerified
+        && bootstrapAction
+            == UpdateClient::ManifestBootstrapAction::FetchCurrentManifest)
+    {
+        UpdaterLogic manifestLogic;
+        manifestLogic.getManifest(
+            appId, channel, currentVersion, targetVersionId);
+        const QString cacheDirectory = QDir(config.updateRoot()).filePath(
+            QStringLiteral("manifest_cache"));
+        if (manifestLogic.verifyManifestSignature()
+            && manifestLogic.saveManifestCache(cacheDirectory))
+        {
+            integrityVerified = integrity.verifyInstalledVersion(
+                appId, channel, currentVersion);
+            integrityError = integrity.errorString();
+        }
+        else
+        {
+            integrityError = QCoreApplication::translate(
+                "Launcher",
+                "The signed manifest for version %1 could not be fetched or cached.")
+                                 .arg(currentVersion);
+        }
+    }
+    else if (!integrityVerified
+             && bootstrapAction
+                 == UpdateClient::ManifestBootstrapAction::CurrentVersionNotPublished)
+    {
+        integrityError = QCoreApplication::translate(
+            "Launcher",
+            "Version %1 is not published on the update server. Publish this exact installed build before distribution so its signed manifest can be verified.")
+                             .arg(currentVersion);
+    }
+    if (!integrityVerified)
     {
         progress.close();
         QMessageBox::critical(
@@ -207,7 +249,7 @@ int main(int argc, char *argv[])
             QCoreApplication::translate(
                 "Launcher",
                 "Application files failed signed manifest verification:\n%1")
-                .arg(integrity.errorString()));
+                .arg(integrityError));
         return -1;
     }
     const auto importOfflinePackage = [&]()
diff --git a/Updater/CMakeLists.txt b/Updater/CMakeLists.txt
index 8841b7f..c87ce0e 100644
--- a/Updater/CMakeLists.txt
+++ b/Updater/CMakeLists.txt
@@ -1,7 +1,5 @@
 set(_updater_sources
     main.cpp
-    UpdaterLogic.h
-    UpdaterLogic.cpp
     UpdateTransaction.h
     UpdateTransaction.cpp
 )
@@ -11,6 +9,7 @@ target_compile_features(Updater PRIVATE cxx_std_17)
 target_link_libraries(Updater
     PRIVATE
         Common
+        UpdateClientUpdaterLogic
         Qt5::Core
         Qt5::Network
         Qt5::Gui
diff --git a/docs/architecture.md b/docs/architecture.md
index 0bbf294..845ed3f 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -118,6 +118,8 @@
 
 带签名的 JSON 合约必须使用确定性序列化，从已签名的负载中省略签名字段，标识算法和密钥 ID，并支持受控的公钥轮换窗口。验证失败将导致系统关闭。
 
+首次安装可能尚无当前版本的本地清单缓存。当设备在线、当前版本已在服务器显式发布且没有更高目标版本时，Launcher 会通过与 Updater 相同的校验逻辑获取当前版本清单，验证签名和身份后写入缓存，再执行完整文件校验。服务器未发布当前版本、返回无效版本 ID、清单签名无效或缓存写入失败时，启动保持关闭失败。此流程不会自动创建或发布服务器版本。
+
 ## 运行时布局
 
 父安装程序拥有最终的布局。预期的可执行文件关系为：
@@ -157,4 +159,4 @@ config/
 *   频道选择和禁止降级行为；
 *   中断更新恢复；
 *   候选失败和成功回滚；
-*   从实际安装位置启动并更新，通过正常的最终用户交互并需要提升权限。
\ No newline at end of file
+*   从实际安装位置启动并更新，通过正常的最终用户交互并需要提升权限。
diff --git a/docs/configuration-and-security.md b/docs/configuration-and-security.md
index 98bfbcc..3ca9cb6 100644
--- a/docs/configuration-and-security.md
+++ b/docs/configuration-and-security.md
@@ -37,7 +37,7 @@
 
 所选的源也包含一个 `initial_state` 对象。它仅提供以下可变键的首次运行默认值。它不会将这些键变为不可变策略，之后的运行时更改仍保留在本地状态存储中。
 
-发布者必须在未跟踪的 `config/config.json` 中提供已签发且非空的 `initial_state.license_key`。示例配置中的空值只支持开发构建；父级 `package_installer` 会拒绝缺失、空值或明显占位符。该值会作为首次运行默认状态嵌入二进制文件，并由 Launcher 写入系统级状态，不会作为可编辑的安装目录 JSON 交付。
+发布者必须在未跟踪的 `config/config.json` 中提供已签发且非空的 `initial_state.license_key`。示例配置中的空值只支持开发构建；父级 `package_installer` 会拒绝缺失、空值或明显占位符。该值会作为初始状态嵌入二进制文件，并在系统级授权状态缺失或为空时由 Launcher 写入；已有的非空机器授权不会被构建默认值覆盖。授权不会作为可编辑的安装目录 JSON 交付。
 
 这些值可能在不同构建之间有所不同，但安装的文件不得覆盖它们。在可执行文件旁边放置名为 `app_config.json`、`client.ini` 或 `config.json` 的文件，不是受支持的运行时覆盖。
 
diff --git a/translations/update-client_zh_CN.ts b/translations/update-client_zh_CN.ts
index 9d27899..5e84c05 100644
--- a/translations/update-client_zh_CN.ts
+++ b/translations/update-client_zh_CN.ts
@@ -225,6 +225,14 @@ Target version: %1</source>
         <translation>应用文件未通过签名清单验证：
 %1</translation>
     </message>
+    <message>
+        <source>The signed manifest for version %1 could not be fetched or cached.</source>
+        <translation>无法获取或缓存版本 %1 的签名清单。</translation>
+    </message>
+    <message>
+        <source>Version %1 is not published on the update server. Publish this exact installed build before distribution so its signed manifest can be verified.</source>
+        <translation>版本 %1 尚未发布到更新服务器。请在分发前发布当前安装构建，以便验证其签名清单。</translation>
+    </message>
 </context>
 <context>
     <name>LauncherErrorMarker</name>