You will need to have signed up for a Netistrar OTE (Operational Test and Evaluation) testing account.
You will need a working fully installed version of WHMCS with full writable access to the installed source base. We have developed the BETA module against the latest version of WHMCS (7.7) using PHP 7.1. At this stage support for earlier versions of WHMCS or PHP is not guaranteed.
To install the WHMCS registrar module you will need to download the latest zip file from Git hub here. Once downloaded and extracted you will need to copy the modules/registrars/netistrar subdirectory into the matching modules/registrars/netistrar directory in your WHMCS installation.