Chimp Rewriter can be downloaded from http://chimprewriter.com/download/
The URL should work as shown above. It's possible there is firewall that blocks the access.
Aiditorial Article Rewriter is the best article rewriter tool. Aiditorial Article Rewriter provides alot of options to customize the software.
ChimpRewriter - Best Article Rewriter - helps rewrite your article in seconds. ChimpRewriter Article Rewriter checks for duplicate after you rewrite.