VMware has released patches for fixing security issues on ESXi. ESXi 6.0, 6.5 and 6.7 are live versions and there is no patch for older version. So if there is any older version in your environment, update the ESXi server immediately to supported versions.
Vembu BDR Server is available as Windows setup file for download and also you can get it for Linux or as virtual appliance to deploying as virtual machine. But you have to ask the sell department to deliver it to you. Linux and virtual appliances are not available as public. This guide might be applicable for next versions and previous versions.