An Internet Download Manager serial number is a product key used for authentication of the full version of Internet Download Manager. The serial number is a distinctive 20-digit alphanumeric combination that is used to register a purchased copy of the software, which can be done through its website.
The Internet Download Manager software is freely available on a 30-day trial basis. At the end of the trial period, the software requires a serial number to continue functioning properly. A serial number can be obtained through the company website after purchase of the fully featured version of the software is complete.