You can upgrade the OpenVPN Access Server software running on the Virtual Appliance by downloading the new Access Server package onto the appliance.
At the Welcome screen (with blue background), select "Login". Enter the username "root" and the root password. Then at the shell prompt ("#"), enter the following commands:
Where the URL_of_new_package is obtained using the Access Server Downloads page and choosing the package for the Ubuntu14 64bit platform (requires logging in to the website using your registered account). Use the full URL path including http:// in the wget command.
The package is updated while preserving the configuration (including license information and all keys/certificates) from the previous Access Server installation.