Iv'e just had another reply:
I found the source of the 500 error - you created a folder with a space: /Source PNGs/
Most code does not like spaces in folder names (or file names). You will either need to rename the folder (best option, will make the foldername much easier to handle) or check with CEON if there's a way to handle the foldername with the space.
But even if that rewrite condition is removed, the links in the site still don't work, just results in 404 not found errors.
I recommend to discuss with CEON - this is not a server issue, but a problem with the .htaccess code/ rewrite code which they need to look into.
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