The Grape VM will be provided as OVA version 1 image that contains a preconfigured system based upon Debian Stretch.
If you want to run Grape in another OS, see Using a custom OS.
The setup procedure is identical with the steps in the installation described here.
The image already contains the basic files needed, so you can continue at Configure Grape.
VMware vSphere 5.1+ or
VMware Hypervisor 5.1+
Windows Server 2012 R2 with Hyper-V or
Hyper-V Server 2012 R2