See the stickied post at the top of this (and every other) sub-forum…you need to submit a support request.
While we can and usually DO retrieve lost license keys upon proof of ownership, please understand that we are not obliged to do so…you should save copies to physical media like CD-R or USB flash drive and save it in a safe place separate from your computer.
Details here… New product support policy, effective February 18, 2014
Scott