Un-install Musescore 2 and 3

I have installed Musescore 4 but see that it does not seem to upgrade the previous versions but add a new one. Can I un-install version 2 and 3 without impacting the functionnality of version 4?

As for the scores themselves created in previous versions, will they still be in the folders labeled Musescore 2 and 3 even if I delete the programs ?

Last, any way to migrate all my scores at once into Musescore 4 , without having to individually open them accept that they are to be converted to Musescore 4 and then saved ?

thank you in advance for your support.