Groupees-related question...

Yes, just use browser an log into groupess and you can see the bundle just like a pc, click directdownload, not sure about iphone but does on androids

From what I know, they usually come in a zip file, so I'm not sure how much of an obstacle that may present to you.

I guess it's possible, but I usually have random issues with groupees when I try to use it from my phone(like stuff not loading).