you have register only if you want to use this beyong 30 days without that anoying 'please register' pop up before the program starts. but, the registration is for the key that they'll give. i gave them my gmail email, and gmail gets their email sometimes, but goes to junk mail folder so, i don't have to worry because gmail has 2.6 gb of storage. if you need a gmail, pls write here again and i can post some invites.