I am having trouble with Halo installing and now it's telling me to purchase the game...

I'm having this exact problem, particularly with Halo Infinite and now the reinstall of Back4Blood. The Halo tab tells me there is an update despite having already installed... this is more of an aesthetic inconvenience than a functional one. Back4Blood however, isn't installing because the only two options available are to 'resume installation' or 'update', as though I am already installing the game, which I am not. I've uninstalled and reinstalled the xbox app, I've ensured that the game is fully removed from my drives, still nothing.

Hello MitchSym! How are you?

What version of Windows are you using? What Build?

Try to update you windows and after that try to uninstall and install apps again from powershell (run as admin). Check this: https://qwertyarticles.com/2018/04/08/using-powershell-to-uninstall-and-reinstall-windows-10-apps/

You try to do a system recovery to a date befor make that?

Do you check at the Installed Apps list?

Thanks for the reply. I tried looking for the app in my powershell list, but couldn't find it. Even using asterisks while using the commands did not work. I believe it just uninstalled incorrectly and now the system isn't even recognizing the folder. Any
way to get around this? I am using version 10.0.1836 Build 1836.

I have Halo MCC through Game Pass. I have been a subscriber for a year now. Do I own it now?

I am worried if I cancel Game Pass I will have to purchase and then re-install the game.