SCOM 2019 UR5 - Unable to import MP's - Sealed assembly file not fully signed

Hi all,

Doesn't matter which MP's I try to import. I'm a little rusty and have a requirement to set up some Biztalk monitoring so any guidance greatly appreciated! This is what I'm getting...

This management pack cannot be imported.

: Cannot load the management pack from the specified sealed assembly file: C:\Program Files (x86)\System Center Management Packs\SC Management Pack for BizTalk Server 2020\Microsoft.BizTalk.Server.2020.Discovery.mp.
This assembly is not fully signed. Cannot verify the strong name signature of the file: C:\Program Files (x86)\System Center Management Packs\SC Management Pack for BizTalk Server 2020\Microsoft.BizTalk.Server.2020.Discovery.mp

Googling hasn't helped either.

TIA