I am a software engineer who apparently is mildly interested in computers and videogames.
First of all, thank you for trying it.
DLC, MOD and Patch file support is on the roadmap until then it’s a solution to just put them into one tar archive or whatever.
Regarding the metadata not being found, it can happen in rare cases, you can simply enter the igdb ID into the remap search bar and that will do the trick, no need to edit files on your server or whatever.
Lastly the Microsoft store is only one of our multiple distribution channels, we also share precompiled executables on GitHub releases. It says it’s unrecommended but don’t worry about it. Check out the client docs for all ways to install the client.
It seems you clearly have no idea what you are talking about. DRM and copyright are not the same, and the legal situation varies significantly depending on jurisdiction.
Many countries, like Germany (§53 Abs. 1 UrhG) and France (Article L122-5, French Intellectual Property Code), explicitly allow “private copies” of media for personal use within private circles, such as family and close friends by law.