Problem after CU4 Studio 2021 - no connection to our server-based TMs

Question

After having installed the Cumulative Update 4 for SDL Trados Studio 2021 SR1 (Build 16.1.4.4184, released on 3 March 2021), my projects have lost the connection to our server-based TMs. 
 I get the error message: "Beim Verwenden der &Uuml;bersetzungsquelle ... ist ein Fehler aufgetreten. Die Datei oder Assembly "Sdl.Core.Bcm.BcmModel. Version=1.7.00, Culture=neutral, PublicKeyToken=c28cdb26c445c888" oder eine Abh&auml;ngigkeit davon wurde nicht gefunden. Das System kann die angegebene Datei nicht finden." 
 Our IT usually includes the CUs in our self-service routine, after I had executed the routine, I get this error message for our all projects and all server-based TMs. 
 Any ideas? 
 
 Kind regards, Ingrid

Oana Nagy · Answer

Ingrid Haussteiner Support Case Id : 00588252. Support case has been logged for your assistance. Please check your SDL Community email address for updates.

Edith Wagner · Answer

Issue was caused by an incorrect or incomplete installation of the latest Cumulative Update. For further information please see: gateway.sdl.com/.../communityknowledge

Trados Studio > 1. Trados Studio

Problem after CU4 Studio 2021 - no connection to our server-based TMs