The latest update to install instructions can be found here, and also in the module downloads README.md file.
- Upload the unzipped module folder into your sites
/modules/addons/
folder. - Make a note of your license key.
- Visit your admin area and navigate to Setup > Addon Modules.
- Click Activate on the module.
- Click Configure to choose the access rights for the module.
- Visit Admin > Addons > WHMCS Module shop.
- Enter your license key and hit save.
- When confirmed you will be shown all available sub modules and have the ability to enable and configure each one.