I had it working fine before, now when I launch it, it keeps telling me to install .net core 3.1.0. I tried installing it, uninstalling it, reinstalling it, repairing it, but it refuses to recognize that it's installed. What do I do??
Maybe try a new installation of Launchbox, see if it works, drop all important folders into new installation.
If this won't help, ask in the Launchbox community.