I recently upgraded a server from 2012 R2 to 2019. The upgrade seemed to work ok, but now when the Dashboard launches I get the message "An error occured while trying to load the plug-in for 485....". I found a post that said to delete the key at HKLM\Software\Microsoft\ServerManager\Roles\485 (and that it would have a value that references Version 126.96.36.199...) Found the key, but cannot delete it. I signed in as a Domain Admin, Rebooted to safe mode, Signed in as the local machine Administrator. Specifically added Domain Admins group with full control. Still have not been able to find a way to delete the key. Tried RegEdit and Regedit32. How do I get delete the key or fix the error?