If you've purchased DayLite from our online store, please visit this link and enter in the email address under which you purchased DayLite. If the online store does not find your license (some older licenses are not in this new store), please contact us. If you have purchased a retail copy of DayLite and you've registered with us, then please email us. You must use the same email address as the one you used to register the license with. Unfortunately we are not able to help if you purchased a retail copy and you have not registered with us. If you have proof of purchase, we can provide you with a replacement license for a small fee.