Here are the few frequently asked question.
Understanding the DOSPRN Registration Key System If you are trying to breathe life into legacy software, getting your DOSPRN registration key to work is the final step to seamless printing on modern hardware. DOSPRN is a powerful shareware utility that bridges the gap between old DOS applications and new USB, network, or PDF printers.
When you run the registration utility (DOSPRN /REGISTER or DOSPRN -REG), the software generates an Installation Code. You (theoretically) send that code to the developer (or a third-party key generator) to receive a matching Registration Key.
Hardware Upgrades: If you upgrade your computer's essential components or move to a new PC, you must use the Online Key Generation Service. You will need your original order number, the email used for purchase, and your new Registration Code to generate a replacement key free of charge. Common Issues and Troubleshooting
Right-click the icon and open the Properties or main window. Click the Registration button.