Xcode stuck on installing
Ditch App Store and use the Apple Developer site to download the xip file and extract it to install Xcode.

Can&#39;t update Xcode


Alternative is to find the file App Store downloaded, and if it's an archive, expand it manually.
Since it's a huge file, it would be easy to find using any of the apps listed at

How can I figure out what&#39;s slowly eating my HD space?