I downloaded an old version of Forge then put a mod on it, it wasn't compatible so I deleted Forge from 'versions' and downloaded a new one.

When I opened the Minecraft launcher again, it only showed the old deleted Forge, and when I try to open it, it says

The version you are trying to play inherits properties of an unknown version

How do I completely remove this old version of Forge so that Minecraft will recognise the new one?

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3 Answers

I suggest using MultiMC.

It allows you to create multiple instances of Minecraft, with or without forge. And it keeps them seperated, so that nothing can interfere with an instance.

It is free and fairly low weight.

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If you don't want to use this MultiMC, or what, like Robin suggested, you can just go to your folders (assuming you are running on Windows), search %AppData% and find .minecraft there, or, go to: C:\Users\YOURUSERNAME*\AppData\Roaming.minecraft , as this is the default location of .minecraft on Windows.

If you are not on Windows (example:Linux), the .minecraft folder is usually located in the "Home" folder as a hidden folder, so you should turn on hidden folder visibility.

So, if you found your .minecraft folder, go to the Versions folder and delete the old Forge version folder.

That's it. I hope it helped :)

Some of these methods don't seem to work. Deleting the folder doesn't remove it from the Minecraft launcher. In the most recent Minecraft launcher (2.1.1433), this worked for me:

1. Start Minecraft
2. Click the hamburger menu and then launch options
3. Click forge version you want to remove
4. Click delete in upper right