Before you start experimenting, back up your important data, or better yet, create a system image using Clonezilla. From what I've seen, the PuerOS documentation is very poor, and there's no information about updating releases—you have to guess. So either they didn't bother to write it or there's something wrong with the updates. Or maybe I was looking in the wrong place? In either case, be careful. Good luck. Regards.

Thank you for the reply.

Yeah, that's normal. If you don't jump through MS's hoops (pay them money) the defender will not recognize your app. I believe there's a button like "more" where you can continue the installation anyway.

Hi I am installing O a.d in Windows 11 and getting the following error message when trying to install the game. Is this normal?  

I’m only using FlatPak because it seems to be newer than the PureOS repositories. Thank you so much for the guide, I’ll try it and let you know how it works out. Thanks!