Hello,
You have to be running macOS Catalina to have Apple Arcade on your Mac, and you have to have purchased Microsoft Office to have those. Microsoft Office 2011 and older will not run at all in Catalina, due to them being 32-bit apps. Newer vesions may run, but I believe the offically compatible versions are Office 365, 2019 and newer.
-Are you running Catalina?
-Do you have Office and which version?
C