Grab a free copy of DupeFree Pro off the 'Net.
I have DupeFree, I like it, but a lot of their features don't work anymore.
I use DF to compare my spins to the original, but I want to use Copyscape (when I get some credits), and compare the results.
If CS agrees with DF I will stick with DF because it is free.
The newest version of DF is in Beta testing.
If it doesn't cost too much I am going to grab a copy of it.