Hello,
We have added some changed to SQLBackupAndFTP (alpha), could you please install the following version https://sqlbackupandftp.com/download/alpha and check if it resolves the issue.
If you still have that error message please go to the “Connect to Server” window and click on the “info” button. Then copy the command and execute it via the Command Prompt to check if you get any error message?
Sorry for the inconvenience.