Are you getting an error? Sometimes updates in Tor Browser itself will break Tor Browser Launcher. There's a good chance that the problem you're experiencing has already been fixed in the newest version. Try installing from Flatpak (instructions below), or build from source.

• [V] I am using the latest version and the problem persists.

After first download of TB, the archive and key at ~/.var/app/com.github.micahflee.torbrowser-launcher/cache/torbrowser remain forever. They are irrelevant because next upgrades are in-app in TB itself. They should be cleaned up to save space.