For anyone trying to upgrade BPS pro from an very old version, but can’t because the API server update is blocking it and you are trying to upload the updated version through the “Upload Zip Install submenu link”.
You might not be able to find the menu item because it’s not there.
In the older versions of BPS pro the link was called something different.
In the BPS pro main menu at the bottom it was listed as “Install/Backup”.
It took me forever to find where it was because I was looking for the wrong menu item.
Just a little F.Y.I for others that need to do the same.