Indianatone, hi!
I am running MusicMatch 10 on 2 Windows 10 pc's - Home & Pro 64-bit.
To get it to work (if you just install MM 10 it will fail - missing px.dll) I needed to install Sonicstage 4.3 which although no longer supported by Sony, you can still get an offline download of the program and a security fix for it from here -
http://forums.sonyinsider.com/topic/...web-installer/
Bizarrely, the install of Sonicstage fails at the OpenMG stage with an error (2501,20703) if you try to install it from an Administrator user account. Instead install it from a standard user account as follows - right-click on the installer file - SOASST-01198207-UN.exe and select the compatibility tab and tick the compatibility as Windows XP SP2 and tick Run as Administrator, Apply the changes and click OK. Then right-click the installer again and take the option to Run as Administrator. When the install completes, you will need to restart your pc. Once logged back in on the Standard user account, repeat the process for the security fix - SOASST-01595000-UN.exe - this does not require a restart of the pc.
Musicmatch 10 can be downloaded from -
http://www.oldapps.com/musicmatch.php - and can be installed from whichever user account contains your music library. Again set the installer to run in Windows XP SP2 mode / run as administrator as above then right-click the installer and choose Run as Administrator to do a Basic install. You need to provide year of birth, name, email address, location to proceed but you can untick the electronic registration to proceed to a custom install - say No to music recommendations, active cache, as there is no server to connect to anymore. Choose file types, music library location to suit yourself. Finally, say No to starting Musicmatch on the Finish box.
Restart your pc. Once logged back in, you can click on Help, Registration, Enter Key.. to enter your licence key to switch to Musicmatch Plus. click on File, Watchfolders, to set up your music folders to be watched and you are good to go.
Any queries on this procedure, feel free to get in touch.