Just a heads up that all versions of our WHMCS templates have been upgraded to support WHMCS 5.0. If you're an existing customer you will have received an email with more details.
Announcement: WHMCS 5.0 Support
We've also made a quick tutorial on how to update your template manually to support 5.0 (V1, V2 only):
Upgrade template to WHMCS 5.0