Mac app store "an error has occurred" and greyed out button for download

I'm trying to download an app in the mac app store.
It's got stuck and nothing seems to get it going again.
I get "an error has occurred" and the button along side is grey.
If I click the button it does a little animated click and nothing happenes.
Any idea how to resolve this?

Run Console to check the recent logs for more details (look for com.apple.installd).
In example, I had something like:
com.apple.launchd[1]: (com.apple.installd[69518]) Job appears to have crashed: Abort trap: 6
ReportCrash[69520]: Saved crash report for installd[69518] version 332 to /Library/Logs/DiagnosticReports/installd_2014*.crash
And when checked backtrace under System Diagnostic Reports, there is something like:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSKeyedUnarchiver initForReadingWithData:]: incomprehensible archive
So it's possible that update files were corrupted. Try to remove these files and re-try again.
See: https://discussions.apple.com/thread/4234582
From Terminal check if you've temporary files here:
    ls -la /private/var/folders/*/*/*/com.apple.appstore
And then try to remove them (you may backup them first just in case):
    rm -frv /private/var/folders/*/*/*/com.apple.appstore
Or eventually run Finder and go to: /private/var/folders and Trash all the folders (if something bad happens, restore it from your Trash).
And re-try again.
Removing all the folders from /private/var/folders it actually fixed the problem on my laptop.

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