升级MacOS High Sierra后安装Xcode 9.3遇下载失败问题求助

Hey there, I know how frustrating this Xcode download issue can be—let’s walk through some actionable fixes you can try next, since the steps you’ve already taken didn’t resolve it:

1. Fully Clean App Store Cache & Preferences #

Sometimes corrupted cache files are the root cause. Here’s how to clear them:

• First, completely quit the App Store (use Cmd+Q, or open Activity Monitor to force quit both "App Store" and "storeagent" processes)
• Open Finder, press Cmd+Shift+G and paste these paths one by one, deleting all contents inside each folder/file:
  • ~/Library/Caches/com.apple.appstore
  • ~/Library/Preferences/com.apple.appstore.plist
  • ~/Library/Preferences/com.apple.storeagent.plist
• Restart your Mac, then launch the App Store again to retry the download.

2. Reset App Store via Terminal #

Terminal commands can help reset App Store services that might be stuck:
Open Terminal and run these commands one at a time (press Enter after each):

killall -9 storeagent
killall -9 appstore
defaults delete com.apple.appstore
defaults delete com.apple.storeagent

After running these, restart your Mac and check if the download works.

3. Repair Disk Permissions & Disk Errors #

Disk issues can interfere with App Store downloads too:

• Open Disk Utility from /Applications/Utilities
• Select your startup disk (usually named "Macintosh HD")
• Click the First Aid button, then click "Run" to start the repair
• Once the repair finishes, restart your Mac and try downloading Xcode again.

4. Remove All Xcode Residual Files #

Incomplete uninstallation might leave behind conflicting files:

• Make sure Xcode is gone from /Applications
• Open Finder, press Cmd+Shift+G and delete these folders if they exist:
  • ~/Library/Developer (user-specific Xcode data)
  • /Library/Developer (system-wide Xcode data)
• Empty your Trash, restart your Mac, and attempt the download again.

5. Alternative: Download Xcode Directly #

If the App Store still fails, you can log into your Apple Developer account and download the Xcode 9.3 installation package directly. Manually installing it often bypasses App Store-related glitches.

内容的提问来源于stack exchange，提问作者Kuldeep