Lost Serial Number

I work for a small sportswear shop.  Our computer crashed and because of that we have to reload our CorelDRAW Graphics Sutie 12 but ran into the problem of not having the serial number on file.  When contacting online support for Corel, they said it's out of date and no longer have support for version 12, to look at the new versions.  Is there any way to find the serial number?  I'm completely lost, anyone able to help me out or are we going to have to buy the newest version?