Xcode on Mac App Store can't install , show disk space not enough

Question

I\'m using the Mac OS to install the XCode10.1.

I have 18.43GB free disk space in the mac,

but when I click the install button on the Xcode from the app store,<

Answer 1

For my case: I already have xcode 10.1 in my MBP.

1. Delete directory ~/Library/Caches/storedownloadd and storeassetd directory in the same dir.
2. Reopen the app store and go for the upgrade page.
3. Download the xcode 10.2 from https://developer.apple.com/download/more/
4. Somehow the app store will automatically install the xcode 10.2 right after download is finished.

Done.