Macos – Can’t download xCode from App Store (Mojave VM Ware)

Try checking your Purchases in the App Store to see if its there, if so you should be able to resume it and/or install it from here if its completed downloading. See https://support.apple.com/kb/HT4485.

You should also be able to clear a download from the Purchases section by clicking the 'X' which would appear next to the 'Status Button' of the item you wish to clear.

For example in the picture below if you hover your mouse over to the left of the 'Downloaded' button a 'X' should appear.

In your case that Status Button should say 'Resume', you can choose to resume by clicking on it or clearing it by hovering to the left of the button until the 'X' appears.

Failing that, call Apple customer service, they should be able to help.

EDIT: try checking for unfinished downloads via the menu bar and signing out/in and retrying the download.

EDIT: try checking and resuming the download in your Launchpad, progress should be shown on/in Launchpad. you can also delete the App in Launchpad by clicking and holding on the App until a close 'X' appears on the App. Then try re-downloading the App from the App Store.

There are a few people on MacRumors who have claimed success installing Mountain Lion on older hardware. The problem is the video card; I believe these hacks are patching things to work with the older cards.

http://forums.macrumors.com/showthread.php?t=1325709

http://forums.macrumors.com/showthread.php?t=1550560

http://forums.macrumors.com/showthread.php?t=1404548