The product distribution file could not be verified
It might be tricky to pick apart the failure with caches being deleted. 

One thing that always works for me is to boot to a USB drive with a clean OS and sign in to the App Store. If I get a failure there, I know the problem is on Apple's side or in the network. 

If not, I have the app and know my system / library are not helping and can take action there once I'm sure the issue is with my customizations and specific install and not a server issue.