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

I had 52 GB available (39 GB purgeable), but the stupid Mac App Store in macOS 10.14.4 still said it had not enough free space to complete my purchase of Xcode 10.2, even after a restart. Solution:

• Quit the Mac App Store.
• Delete directory ~/Library/Caches/storedownloadd
• Relaunch Mac App Store.

My Xcode "purchase" then worked on the first try.

For the curious: At the time I deleted that directory, it did not contain any app downloads. It only contained a tiny (85 KB) SQLite database (.db, -shm and -wal files), which in turn contained four SQLite tables, three of which had zero rows and one of which had only one row and one column containing the schema version number! So this is apparently some weird bug in Mac App Store.