diff --git a/Installer/AppDelegate.swift b/Installer/AppDelegate.swift
index e6f77ff6..873eb4f8 100644
--- a/Installer/AppDelegate.swift
+++ b/Installer/AppDelegate.swift
@@ -162,6 +162,8 @@ class AppDelegate: NSWindowController, NSApplicationDelegate {
 
     if #available(macOS 10.13, *) {
       try task.run()
+    } else {
+      task.launch()
     }
 
     let data = pipe.fileHandleForReading.readDataToEndOfFile()
diff --git a/Packages/vChewing_CocoaExtension/Sources/CocoaExtension/CocoaExtension_Misc.swift b/Packages/vChewing_CocoaExtension/Sources/CocoaExtension/CocoaExtension_Misc.swift
index b90ae244..de38470e 100644
--- a/Packages/vChewing_CocoaExtension/Sources/CocoaExtension/CocoaExtension_Misc.swift
+++ b/Packages/vChewing_CocoaExtension/Sources/CocoaExtension/CocoaExtension_Misc.swift
@@ -41,6 +41,8 @@ extension NSApplication {
 
     if #available(macOS 10.13, *) {
       try task.run()
+    } else {
+      task.launch()
     }
 
     let data = pipe.fileHandleForReading.readDataToEndOfFile()