Well, unless I've gone completely daft (which isn't impossible), the usual place where you could grab the current SDK of CrypKey has apparently caught on and only has the old version available for download. So... as a courtesy to all other reversers interested in exploring this delightful scam^h^hheme, I've upped the CrypKey SDK v6.0 and CrypKey Instant v6.0.311 to the ftp. If any of you have questions about how CrypKey works as far as authentication (I'm into cryptography, not unpacking), feel free to PM me.

Cheers!

PS: We should chat again some time Squidge. There's much research to be done yet!