According to BizTalk 2016 install requirements, if you want to use the SFTP adapter, you need to install a specific version (5.7.7) of WinSCP. If you follow the link on that page, it takes you to the current release, and there’s no obvious way to find the previous downloads.

BUT – see the note below. If you have installed any feature packs or cumulative updates after the initial BizTalk 2016 release, you may need a different version of WinSCP.

It’s harder to find the old versions of WinSCP, so here is the link to get it from SourceForge:  https://sourceforge.net/projects/winscp/files/WinSCP/5.7.7/

BizTalk 2020 requires WinSCP version 5.15.4.  It can be downloaded here: https://sourceforge.net/projects/winscp/files/WinSCP/5.15.4/

HOWEVER…

You also need to install the WinSCP .NET library. See my previous blog on SFTP install for BizTalk 2106.  It refers to another site that has a PowerShell Script to install everything necessary.

ALSO…

The best script that handles multiple releases, feature packs, and cumulative updates can be found here:

Updated: Jan 19, 2021 – This is now an improved Powershell Script to install the proper version of WinSCP for BizTalk 2016 or BizTalk 2020, you can copy/paste it from this page: https://www.phidiax.com/blog/post/biztalk-server-auto-install-script-for-sftp-requirement-of-winscp

It’s smart enough to know which version of WinSCP to install for BizTalk for the most recent releases, features packs and cumulative updates.

From the comments in that program, you can see which version of WinSCP is related to the particular version of BizTalk you are running:

# BizTalk Server 2016
#CU name Build version  KB number Release day       WinSCP Version
#CU7     3.12.859.2    4528776   January 22, 2020   WinSCP 5.15.9
#CU6     3.12.843.2    4477494   February 28, 2019  WinSCP 5.13.1
#CU5     3.12.834.2    4132957   June 25, 2018      WinSCP 5.13.1
#CU4     3.12.823.2    4051353   January 30, 2018   WinSCP 5.7.7
#CU3     3.12.815.2    4039664   September 01, 2017 WinSCP 5.7.7
#CU2     3.12.807.2    4021095   May 26, 2017       WinSCP 5.7.7
#CU1     3.12.796.2    3208238   January 26, 2017   WinSCP 5.7.7
#NonCU   3.12.xxx.x    NA        October 11, 2016   WinSCP 5.7.7

# BizTalk Server 2020
#CU name Build version  KB number Release day       WinSCP Version
#NonUC   3.13.717.0    NA         January 15, 2020  WinSCP 5.15.4