All offered modules are compatible with WHMCS v8.5. No updates have been released - if you are using the last available module version, the module is compatible with WHMCS v8.5.
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