Netfx20sp1 Upd 2021

To understand the "upd" (update) context, one must look at the release timeline. .NET 2.0 SP1 was not a simple patch; it was a full replacement of the runtime.

: Use the official Microsoft .NET Framework Repair Tool or the legacy cleanup_tool.exe to purge broken framework files before attempting a reinstall. netfx20sp1 upd