: Ensure the key matches your specific version (e.g., a "Network Edition" key will not work for a standard "Desktop" installation). Admin Rights

The license manager needs to communicate with ://rstudio.com on port 443. Ensure your network allows this traffic.

Your system date/time is incorrect, or you rolled back your clock. Fix: Synchronize your system clock with an NTP server. License keys are time-sensitive; a skewed clock breaks the cryptographic signature.

The primary "key registration" features in RStudio (now Posit ) involve either for secure Git version control or license key activation for professional products like Posit Workbench. 1. SSH Key Registration for Git