WHMCS Original Software Download links
You can download original whmcs software from links below and upload it on your main public _html folder or subdomain whatever is your billing system
Download Original WHMCS VERSION 8.11.2 --
https://s3.amazonaws.com/releases.whmcs.com/v2/pkgs/whmcs-8.11.2-release.1.zip
Download Original WHMCS VERSION 8.11.1 --
https://s3.amazonaws.com/releases.whmcs.com/v2/pkgs/whmcs-8.11.1-release.1.zip
Download Original WHMCS VERSION 8.11.0 --
https://s3.amazonaws.com/releases.whmcs.com/v2/pkgs/whmcs-8.11.0-release.1.zip
Download Original WHMCS VERSION 8.10.1 --
https://s3.amazonaws.com/releases.whmcs.com/v2/pkgs/whmcs-8.10.1-release.1.zip
Download Original WHMCS VERSION 8.10.0 --
https://s3.amazonaws.com/releases.whmcs.com/v2/pkgs/whmcs-8.10.0-release.1.zip
Download Original WHMCS VERSION 8.9.0 --
https://s3.amazonaws.com/releases.whmcs.com/v2/pkgs/whmcs-8.9.0-release.1.zip
You will then install and your directory and advise.
How to Use WHMCS license :
Download License.php file from https://tremhost.com/clientarea/dl.php?type=d&id=3
and replace it with YOUR-WHMCS-PATH/vendor/whmcs/whmcs-foundation/lib/License.php
