Modern Snapgene versions (v5 and above) require an internet handshake with Dotmatics' servers. A keygen cannot bypass this because the server validates the license in real-time. When you run a "keygen," you are likely running an executable file that will:
Download the official Viewer from snapgene.com. It does everything except edit. You can: Snapgene Registration Code
To obtain a registration code, users can: Modern Snapgene versions (v5 and above) require an