cPanel & WHM version 66 has reached End of Life and will no longer be supported by cPanel except when upgrading to a supported version.
In accordance with our EOL policy (https://go.cpanel.com/longtermsupport), 66 will continue functioning on servers where it is already installed. The last release of cPanel & WHM version 66, 66.0.34, will remain on our mirrors indefinitely. However, no further updates, such as security fixes and installations, will be provided for 66. Older releases of cPanel & WHM 66 will be removed from our mirrors.
We recommend that all customers migrate any existing installations of cPanel & WHM version 66 to the most recent version of cPanel & WHM 68, which you can read about on https://releases.cpanel.com.
If your server setup complicates the process of migrating to a newer version of cPanel & WHM (an upgrade blocker list is available at https://go.cpanel.com/blockers), then cPanel is here to help. Simply open a support ticket at https://tickets.cpanel.net/submit so that our knowledgeable support team can provide recommendations, migration assistance, and more.
For the PGP-signed message, see 66 EOL Now – signed.