If you acquired a license key prior to November 2013 you will have to get yourself a new license key. We decided to build our own license server instead of using a third party application.
XLRstats is no longer licensed under GPL, but under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0) License.
All XLRstats v3. releases will be available on GitHub. You can either fork the repository or download our tags and releases.