WHMCS still supports PHP 7.4 (even the newer versions). The module is compatible with PHP 8.1 - you just need to update the module. The module was updated in January.
You can see information about the module (along with a download link) here: https://help.tcadmin.com/TCAdmin2_advanced_module_for_WHMCS#Download
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Posted by Dennis,
The module is compatible with PHP 8.
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