Question "QMatix XLQ" doesn't work on Windows 10 ?

xlq will run on any version of windows from Windows 7 through to Windows 11. It will not run on any earlier version, i.e. Windows Vista, XP, 95 etc. or light version of windows, i.e. Windows RT or Windows phone. It will not run directly on a MAC, but can be used via parallels (etc.) with Excel for Windows.

you need membership or something to use that site, it should have a help area or instructions

it doesn't need 7 at all.