You can find the download links below.
Download link for Windows: https://shield.nexetic.com/installers/NexeticShieldInstaller.msi
Download link for OS X: https://shield.nexetic.com/installers/NexeticShield.dmg
Download link for Windows Server: [to be added later]
To activate the program you will need to fill in your username and password. They are sent to you via email by your software vendor who has acquired the service for you.