I'm working with someone who's router(?) seems to have decided it doesn't want to download files from the proseries.com domain (not even something as simple as this text file: https://ftpfp.proseries.com/pub/proseries/2020/LICENSE.HTM) . Other than that, there are occasional hiccups with files getting locked... but i'm not aware of any widespread issues. But.. we want to try and fix anything before it does become widespread.
In your case, what specifically is happening? For example, is it failing to create an internet connection, is it failing to download files, or is failing to install files? Is there a specific error message or error code?
Also, I might be able to troubleshoot if you email UpdateLog.txt to proseries_engineering@intuit.com. The file will be in the AppData directory wherever you installed ProSeries (probably C:\ProWin20\appdata\updateLog.txt).
