I have some thoughts.
The error message you're seeing is an indication that the data fetched from gpEasy.com wasn't what was expected.
To really see what's going on though, I'd need to see what's happening behind the scenes. If you'd like, I could upload some php files here that you could up then upload to your installation of php and report back with the output.
If that's a little too involved for you, you can also just download and install the theme manually (See the section "Install Package")
Great, thanks. I much prefer tracking down and fixing problems.
Here's a zip of two file that, when uploaded to your installation, will output more information about what's happening. The two files are:
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