Forza Horizon 4 Removed?

Hi

In December of last year i returned home from the US to Europe and when i got home i decided i wanted to play som Forza Horizon 4 on my computer i booted up the game and it went into a black screen and i thought i'll just restart then, but when i clicked
the icon to start the game had removed itself from my computer and i went into the Microsoft store and it said i didn't own the game anymore but bc i bought the Ultimate Edition i still owned all of the DLC and extra items for the game but as said not the
game, now i'm totally lost and it seems to be a glitch in the Microsoft store but after asking multiple times to Microsoft support nobody has returned with some kind of help or fixes its very annoying to not be able to the best racing game in my opinion i
months now

Please help Microsoft!

:)