diff --git a/apps/memos-local-openclaw/install.ps1 b/apps/memos-local-openclaw/install.ps1
index 449831756..f4a9513c3 100644
--- a/apps/memos-local-openclaw/install.ps1
+++ b/apps/memos-local-openclaw/install.ps1
@@ -184,10 +184,13 @@ if (!config.plugins.allow.includes(pluginId)) {
   config.plugins.allow.push(pluginId);
 }
 
-if (!config.plugins.slots || typeof config.plugins.slots !== "object") {
-  config.plugins.slots = {};
+// Clean up stale contextEngine slot from previous versions
+if (config.plugins.slots && config.plugins.slots.contextEngine) {
+  delete config.plugins.slots.contextEngine;
+  if (Object.keys(config.plugins.slots).length === 0) {
+    delete config.plugins.slots;
+  }
 }
-config.plugins.slots.contextEngine = "memos-local-openclaw-plugin";
 
 fs.writeFileSync(configPath, `${JSON.stringify(config, null, 2)}\n`, "utf8");
 '@
@@ -298,6 +301,20 @@ finally {
   Pop-Location
 }
 
+$nodeModulesDir = Join-Path $ExtensionDir "node_modules"
+if (-not (Test-Path $nodeModulesDir) -or @(Get-ChildItem -Path $nodeModulesDir -ErrorAction SilentlyContinue).Count -eq 0) {
+  Write-Warn "node_modules was cleaned by postinstall (version upgrade detected), re-installing..."
+  Push-Location $ExtensionDir
+  try {
+    $env:MEMOS_SKIP_SETUP = "1"
+    & npm install --omit=dev --no-fund --no-audit --loglevel=error 2>&1
+  }
+  finally {
+    Remove-Item Env:\MEMOS_SKIP_SETUP -ErrorAction SilentlyContinue
+    Pop-Location
+  }
+}
+
 if (-not (Test-Path $ExtensionDir)) {
   Write-Err "Plugin directory not found after install: $ExtensionDir"
   exit 1
diff --git a/apps/memos-local-openclaw/install.sh b/apps/memos-local-openclaw/install.sh
index b8229d17a..c69904d27 100644
--- a/apps/memos-local-openclaw/install.sh
+++ b/apps/memos-local-openclaw/install.sh
@@ -246,10 +246,13 @@ if (!config.plugins.allow.includes(pluginId)) {
   config.plugins.allow.push(pluginId);
 }
 
-if (!config.plugins.slots || typeof config.plugins.slots !== 'object') {
-  config.plugins.slots = {};
+// Clean up stale contextEngine slot from previous versions
+if (config.plugins.slots && config.plugins.slots.contextEngine) {
+  delete config.plugins.slots.contextEngine;
+  if (Object.keys(config.plugins.slots).length === 0) {
+    delete config.plugins.slots;
+  }
 }
-config.plugins.slots.contextEngine = 'memos-local-openclaw-plugin';
 
 fs.writeFileSync(configPath, `${JSON.stringify(config, null, 2)}\n`, 'utf8');
 NODE
@@ -305,6 +308,14 @@ info "Install dependencies, 安装依赖..."
   MEMOS_SKIP_SETUP=1 npm install --omit=dev --no-fund --no-audit --loglevel=error 2>&1
 )
 
+if [[ ! -d "${EXTENSION_DIR}/node_modules" ]] || [[ -z "$(ls -A "${EXTENSION_DIR}/node_modules" 2>/dev/null)" ]]; then
+  warn "node_modules was cleaned by postinstall (version upgrade detected), re-installing..."
+  (
+    cd "${EXTENSION_DIR}"
+    MEMOS_SKIP_SETUP=1 npm install --omit=dev --no-fund --no-audit --loglevel=error 2>&1
+  )
+fi
+
 if [[ ! -d "$EXTENSION_DIR" ]]; then
   error "Plugin directory not found after install, 安装后未找到插件目录: ${EXTENSION_DIR}"
   exit 1