Actually one of the easiest way to install it!

Download link: [ Ссылка ]

Text Tutorial:
1. Press the start button and r start+r

2. Type in %appdata% and press enter

3. open .minecraft

4. Goto folder version and paste the TooManyItems folder into it

5. Open up minecraft and create a new profile

6. Choose a new version called TooManyItems

7. Let it download and now you have it!

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