Where has my GarageBand gone?
There is a small print at the bottom of the download info page for the GarageBand ver 10.1.

- Requires Apple Music Connect Account

Do you have one ?

But here is the good news. I do not have the Apple Music Connect and was able to get the GarageBand 10.1 update.

I have a MBA 2012 with Mavericks (10.9.5) and here is the process I had to do.



need to accept this then continue with download









You will be asked to log in again to complete the download/installation.

And it is ready to go: