If you previously purchased a license and lost your code, your best bet is to contact the original vendor. Even though the product is legacy, they often maintain a database of previous purchases. virtualcd-online.com
Look for their "Trial to Full" conversion or "Lost Key" support pages. 3. Modern Alternatives (Often Free)
If you just need the functionality (creating virtual drives or ISO images) on a modern version of Windows (10 or 11), you might not actually need Virtual CD anymore. Windows now has built-in support for mounting files directly.