How do i install mods for Windows 8.1

Is UltimateLib showing in your mods list??

I would suggest you try another mod, this mod might not work as it should.

no

okay i will let you know if it works.

Please post a snapshot of what is in your UltimateLib folder

You need to extract the zip file - the game cannot read what is inside zip/rar files.

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It works now thanks!

I saw that you are using Windows… jk

You should download 7-zip, as it is a better tool for extracting .zip .rar etc. It is also completely free! http://7-zip.org/