You get an integration to Claris Connect and Claris Studio. You can now place text with calculations directly on a layout. FileMaker is compatible to macOS Sonoma with some known issues and you may enjoy a few bug fixes. But please read details in the release notes:
FileMaker Pro 20.2.1 release notes
FileMaker Go 20.2.1 release notes
FileMaker Server 20.2.1 release notes
macOS Sonoma (14.0) and iOS 17 compatibility
You can download it on the ESD website. The link is in the license email from Claris.
For MBS Plugin, just make sure you have a 13.x version. We fixed a few minor things over the beta test period, so recommended version is 13.4.