I was able to unzip them no problem. I repacked them in an attachment below, see if they work for you. If not then somethings up with your system.
The gradient file names have an asterisk at the beginning. I didn't test them in Gimp, they may work fine as is or you might have to remove the asterisk from each one.

I unzipped countless other zip files,except those that He posted, the message I get is "invalid"
Are you using the windows unzipper? If I remember right, I think on my old PC,I used a program I downloaded that did zip files and rare files. Maybe its a Windows thing that wont let me?

I am still getting used to Windows 8
Anyways Thanks

I've attach a ZIP file version to the post above, give it a go. If you can't unzip either of those or the one from DeviantArt it's likely a problem at your end. In the ZIP file I renamed the gradient file without the asterisk, maybe that is the issue.

I am pretty sure thats the program I had on my old PC 7zip

I still find it strange that the one from Microsoft wont work

But, I will do that, get the 7zip

THANKS GUYS!