You can update to the latest version of WHMCS using the Automatic Updater. Simply navigate to Utilities > Update WHMCS to begin the update process. As always, a download is also being made available for those who wish to install or upgrade manually. You can download WHMCS 8.1 from our downloads page. If at any point you get stuck, our support ...
Auto update is back if you use WHMCS 7.10.2 you can update it now to 8.0.4 from Utilities>Update WHMCS
But if I encountered a problem or you have 8.0.3 you can update it manually by download it from here : https://kb.licenses.cc/whmcs-download-link/
If at any point you get stuck, our support team is available to assist you.