ive came onto my launcher and i wanted to play minecraft 1.12.2, however when i went to make an installation it only showed the current installations that i have made i.e. 1.17.1, 1.13.2, 1.7.10 etc, i tried fixing it by reinstalling the minecraft and repairing it from the installer but it has made the issue worse and now i cant play minecraft at all because all it shows when i press play is a message saying "Sorry, unable to start Minecraft. Please check your configurations." and on top of it says that there is no installations