Most GPL products provided by AlphaGPL are pre-activated or designed to work without a license key. The "License" prompt you might see in some plugins is typically for automatic updates or support from the original developer, which we replace with manual updates (you download the new version from us).
Download the .zip file from your AlphaGPL dashboard after purchase.
Sometimes the download contains documentation and the actual plugin/theme zip inside. If you see a "UNZIP_FIRST" in the filename, extract it first to find the installable zip.
Go to your WordPress Admin Dashboard:
Click "Install Now" and then "Activate".
If you get this error when installing a theme, it means you uploaded the whole package instead of just the theme file. Unzip the file you downloaded and look for the specific `theme-name.zip` file inside.