Musescore 4.4 studio will not install

Hi I've been using musescore 4.4 for quite a while, not sure which version. I saw that there was a new update 4.4studio which looked good. Sadly it has totally failed and I cannot get back to my earlier version 4 at all. I do have musescore 3 which works but I've been using the v4 import features to prepare to direct a choir in 3 week's time! What to do?? I have done system restore, cleaned the registry etc but it keeps asking for something about version 4.1.1. Is anyone else having issues like this please?