You (or a script) modified the .rk file. The file contains a cryptographic signature.
This article provides a complete, 360-degree breakdown of the Reaper license key—what it is, how to buy it legally, the difference between commercial and discounted licenses, how to install the key file, and why avoiding "cracked" keys is dangerous for your studio. Reaper License Key
: For personal use, or if you earn less than $20,000 USD per year from your audio work. Commercial License ($225) You (or a script) modified the