musescore upgrade

Hi. I bought a new computer and have transferred the musescore files etc to it. It will open musescore 3, which is the version I had , but now says the files were saved in a newer version (how, when I only had version 3?). The pop up recommended downloading Musescore 4 but when I followed the directions it downloaded MuseHub, and I can't see on that where to get to the standard musescore program? What am I missing?

Thanks

Penny