WHMCS 8.9 introduced new PayPal® payment gateways, on-demand renewals for product addons, and new admin permissions for invoices.
When you update WHMCS, the system will attempt to delete unused legacy modules. This helps to prevent problems due to older PHP code.
We sometimes release security updates to address important issues and vulnerabilities that could affect your WHMCS installation. We recommend downloading security updates as soon as possible.
If you have remained on a WHMCS version that is past its End of Life (EOL) date for multiple years, we recommend that you update WHMCS as soon as possible. Make sure that you meet the system requirements for each EOL version that you upgrade through to reach a modern, supported version.
WHMCS automatically checks for new updates daily. You can also check for updates to WHMCS manually from within the Admin Area.
Before you update your WHMCS installation, we recommend several preparatory steps.
You can set a maintenance message to display while you update WHMCS.