Impossible to use the new sheets on my Musescore 3.

So I downloaded and installed MuseScore 4.
But it doesn't work on my PC (with Windows7). :-(
That's because some DLL were missing.
So I downloaded from internet a lot of them, at least 10.
At the end of all this, I got another error message! :-(
See the attached image, please.
I also tried the Help Center, but I can't find anywhere the so called "chatbot". :-(
Is anyone here able to help me, please?