Yes FTPS is supported:
https://winscp.net/eng/docs/ftps

FTPS is a suboption of FTP.
Select FTP protocol and then you will have an option to enable encryption.
See
https://winscp.net/eng/docs/ui_login#session_settings

Though switching from SFTP to FTPS seems like a really bad idea.

We are presently using WINSCP for our FTP transmissions with various data feed vendors. All are using SFTP.

One of the vendors is strongly recommending that their customers switch to FTPS in upgrading to their latest version. They do not have a end date for support of SFTP yet.

I downloaded the latest WINSCP, but I did not see FTPS in the drop down of options.

Is FTPS supported and if not are there plans to support it in the near future?

Thanks,
Frank