You can buy a single-user license at Thermo Fisher Scientific or a 5-user license directly from Thermo Fisher Scientific .
Because the software is no longer actively marketed, official support for lost codes is limited. How to Find Your Missing Registration Code Primer Express 3.0 1 Registration Code
Once you have obtained the official registration code, follow these steps: Install Primer Express v3.0.1 on your computer. Launch the application. You can buy a single-user license at Thermo