My Minecraft isn't letting me download anything?

So here's the issue, my Minecraft will not let me install anything. No texture packs, no worlds, no mods. I used to have a mine craft and everything worked fine but one day i deleted it it and now i redownloaded it and when I follow the regular mine craft steps to install texture packs or worlds, it doesn't work! The launcher works perfectly fine tho so I don't know what to do!
P.S: I have a mac, and my minecraft version is 1.7.4

Type Curse.com install it open the program create a account type whatever texture pack you want it will automagically download the packs you want for you