Since it is no longer being updated, there are no "surprise" bugs from new patches.
Click "Activate" next to "rekordbox dj" and paste your code. rekordbox 5 license key
If you cannot find a legitimate key, the best path forward is to use a Hardware Unlock controller or transition to Rekordbox 6/7, which offers a free tier for basic library management and export. Since it is no longer being updated, there
Many Pioneer DJ controllers act as a physical "key." When you plug these devices into your laptop, Rekordbox 5 automatically unlocks Performance Mode without requiring a typed-in license key. Common hardware unlock devices for Version 5 include: DDJ-400, DDJ-800, and DDJ-1000 DDJ-RB, DDJ-RR, and DDJ-RX XDJ-XZ, XDJ-RX2, and XDJ-RR Many Pioneer DJ controllers act as a physical "key
If you purchase older gear second-hand, such as a DDJ-SB2 or early CDJ units, they often came with a printed license key card in the box. If the previous owner never activated it, or if they deactivated it from their Pioneer account, you can still use that key to activate Rekordbox 5.
If you tell me which DJ controller you're using, I can confirm if it's a device or if you'll definitely need a manual key .