A support agreement is required to access the Check Point TAC and many of our software downloads.
Endpoint Security VPN client installers include an uninstaller, which I believe will also work for the full Endpoint.
You can download E87.30 (latest release) for macOS: https://support.checkpoint.com/results/download/127175
(No support agreement is needed to download this file)
Note that the Harmony Endpoint client is typically configured with a password that must be entered in order to uninstall the client.
This is a security feature and without this password, you will not be able to uninstall it.