The below URL Please have a look,
Thanks & Regards,
The latest version is 9.24
The latest version is 9.24, but not sure about the First version. But had a chance to work on Mendix version 4.
You can also check the link for more details: https://docs.mendix.com/releasenotes/studio-pro/
To know the exact details You might raise a support ticket for accurate information or you can also post in the Mendix slack community: https://mendixcommunity.slack.com/