If your software came bundled with a USB video capture card, check the body of the USB device. Some manufacturers print the license key on a small silver or white label attached to the hardware.
If you are staring at an installation screen asking for a serial number, here is everything you need to know about finding, recovering, or dealing with a missing honestech TVR 2.5 product key. Where to Find Your Original Product Key honestechtvr25productkey
If the software is still installed on an old computer and you just need the key to move it to a new one, you can sometimes find it in the Windows Registry: Press Win + R , type regedit , and hit Enter. If your software came bundled with a USB