Fitforms Integration not available in Version 4 of Builder and now no way to go back to Version 3?

I was using the help information to integrate and setup a fitform integration.  Howevere it appears that Fitforms Integration not available in Version 4 of the Builder and now there is no way to go back to Version 3?

Can you advise if there is a workaround so I can configure a form to work with Fitforms in Version 4?

Unfortunately, our back-end developers already disabled the Form Builder Version 3.

Thank you for your understanding.