CU4 for BizTalk Server 2020 is now available for download.
For details on fixes and download link, please follow the master KB:
https://support.microsoft.com/help/5009901
You may want to...
File name: 'WinSCPnet, Version=1.8.3.11614, Culture=neutral, PublicKeyToken=2271ec4a3c56d0bf' ---> System.Exception: SFTP adapter requires WinSCP to be installed. Please refer http://go.microsoft.com/fwlink/?LinkID=730458&clcid=0x409 . ---> System.IO.FileNotFoundException: Could not load file or assembly 'file:///C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Microsoft.BizTalk.Adapter.Sftp\v4.0_3.0.1.0__31bf3856ad364e35\WinSCPnet.dll' or one of its dependencies. The system cannot find the file specified.