All modules are compatible with WHMCS v8.6 and PHP 8.1.
Shortly after the release of WHMCS 8.6 beta we started to make our modules compatible with version 8.6 and PHP 8.1. Updates for all modules were released on 2022-09-22.
After the release of WHMCS 8.6 stable (2022-11-03), we checked the compatibility of each module again and no further updates had to be released.
We are aware of how time-consuming WHMCS updates are for highly customized installations. For this reason we put a lot of effort on backward compatibility and almost all our modules work from WHMCS version 6.0 up to the latest version. You can find the exact details about the compatibility of each module in our store: https://whmcs.deploymentcode.com/index.php?rp=/store/modules