WinSCP Plugin for Altap Salamander

Based on these two pages:
https://www.altap.cz/salamander/help/winscp/ui_login_sftp/
https://winscp.net/eng/docs/salamander#opening_winscp_plugin

I can see there is an WinSCP plugin for Altap Salamander.

But I can’t seem to find it. Do you have to install the plugin?
Or what keys do you hit.

When I try ALT-F1 or Alt-F2 as mentioned, I see an FTP manager, but nothing for SFTP.

I looked under plugins manager and don’t see anything under SFTP or WinSCP.