@Jarl-Penguin You could see the Error code was for in-20100125-1. However my copy is now bugged regarding in-20100125-1. In the "Create Installation" part of the launcher, the option for in-20100125-1 under Version has greater than and less than signs on it, like this: <in-20100125>. For some reason, these signs cause the installer to break, and I can no longer play in-20100125 on my device. I have reinstalled the Minecraft Launcher multiple times however it doesn't change. I couldn't find any other versions that have this issue.
@Zgajak I tried using the Legacy Launcher and I got the same error message. Isn't the Legacy Launcher the Tan one?
I believe this is the "Duplicate" They're talking about...
@Jarl-Penguin If you're using the legacy launcher (the tan one), then in-20100125-1 won't appear. For in-20100125-1 to be installable, you'll need to use the normal installer (the green one).