It's impossible to TorrentZip the same file and it not have the same CRC. It creates the exact same file and that is why it's used for resuming torrents. And if two people download the same file from the same website, how can the CRC be different? Unless they have been rezipped and reuploaded. If you both go to the website now and download the same file.. hang on a sec. I think I know what is happening here. The KillerGorilla sets are in packs and zipped up. To use TorrentZip you would need to uzip all the packs then run TorrentZip on the set, it will unzip then rezip them all. Then the crc's should definately match. I'm guessing if your using different unzip apps it might cause a different crc. Try downloading the same version of 7Zip and unzip them and see if the crc's match. If not run TorrentZip on them.