From a Mac,
-Go to this website: https://tunnelblick.net/downloads.html
-Download the stable version of Tunnelblick.
-Retrieve the email that Alkivi sent you containing the VPN archive.
-Place this archive on your desktop and unzip it (by double-clicking on it).
-Change the folder's name by adding ".tblk" to the end.
-Accept the extension change by clicking "Add."
-Double-click on the newly created .tblk file.
-Click on "Only me."
-Enter your computer's password.
Tunnelblick is now installed.
From now on, simply click next to the clock at the top right on:
- Connect to "name of your file".
And you're all set!