help with playing

[gunqqer]

I downloaded the launcher/platform or what ever, and when i hit play, even with vanlila, it gives me a error message saying "Error downloading file for the following pack:" then it says "Failed to download" then the URL for something and then "please consult the modpack author" but when i hit the settings  and change folder i can never get a folder it likes, which i think is the problem, but i dont know how fix it so can someone help me? please!

[gunqqer]

oh btw im using a mac