Instead of wasting time on a dead end, the smart, safe, and future-proof path is to move to the current version of rekordbox.

If you already own a key, it remains valid for Rekordbox 5. However, these keys cannot be used to activate "Performance Mode" in Rekordbox 6 or 7.

: Since December 2021, new hardware no longer includes the black license key card previously used for version 5.

A key distinction: With Rekordbox 6 or later, you don't need any license key at all. The software uses a subscription plan system for those without hardware unlock devices.