If you lost the serial number, go to https://www.bandicam.com/bandicut-video-cutter/buy/
and enter your purchasing email address at the license check section. Your license will be sent to your email again.
If you can't access your email, please send your payment receipt to firstname.lastname@example.org
For more information, refer to https://www.bandicam.com/bandicut-video ... se-policy/