Hi,
without knowing the environment, have you had a look at the:
E80.65 Remote Access VPN Clients for Windows
especially this document
E80.60 / E80.61 / E80.62 / E80.64 / E80.65 Remote Access Clients for Windows OS Administration Guide
There are chapters about creating the correct msi File and distributing it i.e. via GPO. When you do not have kind of Client Management (SCCM or so), but a Windows Active Directory, the GPO way might be the easiest one.
Regarding Deployment via GPO:
Howto use GPO to deploy software packages
If you cannot use GPO, I´d suggest to just set up a web server, where clients can download it and write down a 2 or 3 side document, how to manually install the client.
Regards,
Daniel