Running into install issues

[evilpanda99]

I'm trying to download pixelmon and a couple other packs and i'm running into the same error on all of them. From what i've been able to gather, this seems to be a product of some issues mojang had recently, im also having issues with the offical minecraft launcher. Just wanting to see if anyone else is having issues and if so what has worked to fix it.

as a side note, i have downloaded said file that this error says it could not download. just dont know what to do with it.