In the page that lists your game, push Ctrl-A to select them all, then right click and mouse over "Set Platform". You can pick between MS-DOS, Windows, and GOG or set your own platform.
At the top of the web page click "Help & Support" and then "Request a feature". Unsure what all is available for us to use as a way to tell that. Interesting idea though. If you could use the feature request people could vote on it and we could see how many would benefit from it.
Do you have any of these issues if that plugin isn't used? Curious if the plugin is manually changing that field to match whatever settings you told it to use.
Can you reinstall over top your existing install. LaunchBox is having issues loading the DLLs it needs. Doing this won't affect your data at all. Just makes sure you install in the same directory and don't accidentally create a LaunchBox directory IN the LaunchBox directory with the installer (\\Launchbox\Launchbox)
Inside of Steam. In the Main UI you have the headers Store, Library, Community, and then your profile name. Click the profile name. On the page that loads on the right there should be a link that says "Edit Profile" click it. Should bring you to the page you need.
Looks like you are on beta. Beta installer should have done this for you (assuming you converted after beta2). Easiest way for most would be to revert to 11.2 using the installer in your Updates folder. Then run LaunchBox and let it detect the most recent beta version and download the installer for it and let it run. Should resolve this issue since the most recent version has the NET Core installer embedded in it. If you don't need the beta features right away can wait until official release as well.
Would install 11.2 over your current installation. Run LaunchBox, let it detect the most recent beta version and let it download that, then run that install. Installer has the needed .NET Core installer built in it and as long as you don't cancel out the process while it runs should install what you need and get you back up and running.
LB only focuses the game if the game is in the current sidebar filter. If it isn't we don't attempt to change your filter to select it.
This isn't new it is how that feature works. Will skip any files that are already in use, or have the same Title and Platform as something already in your collection. Because on filename title check we cut off any values in parens or brackets what you are seeing makes sense.
@Chaotic Viral @Wanderer189 I'm unable to replicate this. You are using credentials for logging into gamesdb.launchbox-app.com and not forums.launchbox-app.com correct? They are not the same account which causes confusions sometimes.