You downloaded the source file, click the "Download" link, and get the actual mod
Does it matter? There's no difference in installation, drag and drop as usual.
Several other examples of mods being in jar files instead of zip: Forestry, IndustrialCraft, Factorization, Metallurgy, ExtraBiomesXL
Not any more you have to drop it in the coremods folder.
i have 67 mods installed and something weard happens. i get in my world i search something with NEI and suddently the search ting is gone. the name tag is also gone. can anywone help me? it is just for dat world and if i delete the NEI data it get fixed for 5 mins. i had inv tweaks and it is not dat but the thing i am talking abaut also made it so chests inventory looks weard and when e try to move something from my inventory to a chest its like hitting q. i hope somebody will help me PLEASE!