Quartus Prime Pro 20.1 install hangs

So heads up, the problem was corruption of the .tar file. I'll have to talk with the network experts, but copying the .tar to a network drive does the damage, which I could confirm by checking against the published SHA1 checksum. If I use 7zip to extract from the network version there are no complaints but the install consistently hangs.

Why the installer doesn't perform any kind of corruption check is a bit surprising in this day and age is somewhat surprising to me. Ditto, why TARs when zips would be easier for most users.