Major versions have their own registration codes. A 2019 code will not register 2021 (v21).

Select "Enter Registration Code..." from the "Help" menu. Toolbar: Click the "Register" button on the toolbar.

If your machine lacks internet access, navigate to the offline registration tab, then enter the name and code provided in your purchase email. Locating Your Registration Code

If a registration notice appears when opening the software, click the "Enter Registration Code..." button.

Disclaimer: This guide is for licensed versions of PowerArchiver. The software offers a 30-day evaluation period. To make sure you get the right info, can you tell me: Did you the license, or was it from a giveaway ? Are you getting a "code not working" error message? If you provide these, I can offer more tailored steps. Advanced Installation instructions - PowerArchiver Help