Updating to Final Cut Pro 11 on Mac

I want to update to Final Cut Pro 11 on my MacBook Pro with M1 Max. It introduces useful features such as the Magnetic Mask (to isolate people and objects within a video clip without the need for a green screen or the labor-intensive process of rotoscoping) and Transcribe to Captions (automatically generates closed captions directly in the timeline). These features would be very useful for my workflow.

Questions:

1 - I'm currently unable to find the update in Mac App Store. Is anyone else able to update to it?

2 - How has your experiences been with updating older Final Cut Pro libraries to the current version? Has it been stable or has the libraries needed to be converted?

3 - What languages are supported for the Transcribe to Captions functionality?