Plutonium

The sale of cods for example of bo2 mw3 bo1 and such have been allowed on the Xbox app on pc are they able to be verified from there or can I only use the steam versions

They just allowed the sale for older cods on Xbox on pc am I able to verify and use that version of the game

Dss0 i know im way late on this but my launcher was working 2 days ago and now it wont work at all and says im missing files and reinstalling would fix it ive reinstalled the lancher over 10 times and it hasnt been working