I've had EQ since EQ was MSDOS only. Still have EQ on floppy discs but no floppy disc drive on computers anymore. LOL. If you registered the software when you bought it the EQ website has your registration number stored. EQ5 I think was the last version you had to manually register. EQ7 is downloaded online. You can have it on any two computers at one time and download as many times as you want. If you have EQ5 you don't need it to install EQ7, the upgrade won't work from EQ5 to EQ7, only from EQ6 to EQ7.