I cant see your pictures because im at school and photobucket is blocked, but to download this is how i do it. Usually i get brushes from DeviantArt.com. Click download and save it as "all file types" instead of a zipped folder. Then, open and drag into your gimp brushes folder. On my computer i go to hard disk drive, program files, gimp, share, then into the gimp folder again, then brushes.
Hope that helped, i used to know how to do the same with fonts, im not exactly sure but instead of saving into the gimp folder it has to be saved into the fonts folder your computer has..
DeviantArt.com is good for stock resources