Offline redemption
The easy path doesn't need this page: paste your licence key into Help → Register Resonode… and the app activates it in one quick round-trip. Redeem here instead if the machine never touches the internet — or if it runs the Linux build, which skips the networking layer entirely. Either way you'll get an offline RESO- key to carry over on a sticky note.
Your offline key
On the offline machine, open Help → Register Resonode…, enter the name exactly as shown below (capitalisation and spacing don't matter) and this key. It validates entirely on that machine — no internet involved.
Lost it? Come back any time — the same name and licence always produce the same key.