E-mail address?
You will need to send your mail from your registered e-mail address.
Typically this will be the e-mail address from which you made your original payment.
Hardware ID?
To get your hardware ID:
1) Start Flopzilla
2) Go to "register" in its menu
3) It's the code that looks like 1559-121F-QC6B-BB42-4828-00C4-687E
Or watch
this video on youtube on getting your hardware ID.
Key nr.?
A Flopzilla license entitles you to register the software on two computers. For this value, fill in either 1 or 2.
Should you not enter a key number, then it will be treated as being 1.