I'm sorry for the frustration.

At what point are you getting a "Network" error? When you try to download from 2019 and/or MyAccount? Or after you download and you run the installer?

If it's when you download from the product / MyAccount, can you try our direct link for basic?

https://ftpfp.proseries.com/pub/proseries/2020/BasicInstallerTY20.exe

If it's when you run the installer, does it happen immediately right at the start or at the end after you've selected your states?

If possible a screenshot would help diagnose, or detail on the exact message being shown and where it's being shown.