Hello, In 2007 I purchased Maxim LE software that came with on a CD-ROM when I bought a QSI 532 CCD camera from Quantum Scientific Imaging. I registered the software with Diffraction Limited during the 30 day temporary period and was subsequently sent a permanent number allowing me to continue with the software and have free upgrades for the next 12 months. Unfortunately I have lost the email with the license number and have changed laptops since that time. I can provide you with details regarding the QSI camera as proof of purchase of both hardware & software in a private email upon your request. I have installed the QSI camera drivers, Maxim LE and QSI Addon on my current laptop but cannot run the software since it is asking me for the license number. Any assistance you can provide would be greatly appreciated Steve