Alright, so they have the new launcher now. It's never been working for me, but on the site it said that deleting old versions might help it run better, so I did just that. But now, it refuses to even open, giving me this. Does anyone know how to fix this? Do I need to buy Minecraft again, and will the Sandlot still be a server I can access or will I need to be whitelisted again? Has this happened to anyone else? If so, what's the problem? I recovered everything from the recycle bin, but still don't have Minecraft (the old launcher) installed anymore. I would love to know how to fix this at the soonest convenience, as I'd still like to be able to play Minecraft on Java and on the Sandlot.
I have been having problems with the new launcher too. So far, I do not like it. I would recommend reinstalling the old launcher and continue using it until the new one has fewer bugs. You can still download it from here: https://launcher.mojang.com/download/MinecraftInstaller.exe You might have to login to minecraft.net for that link to work. Do not worry about losing access to The Sandlot. The launcher will not do anything in regards to your whitelist status. If you don't have Sandlot listed in your server list anymore, just re-add it. server.sandlotminecraft.com