When you click download link on the download tab this is what you see and should do

1.
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Never press download button on the ads!
DO NOT press the ads either.
These possibly could lead you to virus
ONLY press the "Skip" button that is marked.


2.
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If nothing happens here, click on the blue link on the page. (you can click on the link just to make it go to next page faster)



3.
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Click the Download button.





4.
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save where you want it (most likely on the mods folder in .minecraft folder.