.NET Framework 5.0 SDK error installing x64 SDK

When installing x64 .NET 5.0 SDK with Visual Studio 2019 16.8.0 the below error is thrown: Error 0x80070643 - Fatal error during installation.

Also installed (successfully) x86 version. But still cannot Target framework: 5.0

log file snippet: [383C:387C][2020-11-11T23:17:37]i371: Updating session, registration key: SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall{c0d1830b-4a91-46dc-981e-ebf607e87cfc}, resume: ARP, restart initiated: No, disable resume: No [39D0:22F4][2020-11-11T23:17:37]i399: Apply complete, result: 0x80070643, restart: None, ba requested restart: No