I received a beta patch yesterday that resolved the problem of not being able to activate instruments received with purchases of Samplitude Music Studio. This particular problem is due to the completely new method of obtaining/downloadingactivating/buying the add-ons, etc., through the Store. I have been following these through many versions.
This has not been my experience Magix does indeed fix most bugs. They really need to look at the software from the ground up because to release a broken version and expect money for it is totally disrespectful. That's certainly my experience trying to get resolutions from them on other bugs over the years. Sadly, Magix have a very poor history of NOT fixing bugs in Music Maker, so I doubt this will ever be addressed by them.