I too have been trying to run DDVE in VMWare Workstation Pro 12. Have tried several ways to run and last attempt to contact support, last year sometime, suggested it was not supported. Has there been anyway to run from VMWare workstation ?
The OVA passed the startup checks in VMware Virtual Box for me. I don't know for certain if Workstation will run it, but I can't see an obvious reason why it would not. You'll still need to meet the space requirements, as listed in the installation guide, but it should install and plumb the two virtual network interfaces it needs.
Let us know if that helps!
For tesing, I've installed ESXi on top of VMware Workstations. I don't see a reason why DD VE shouldn't run at least under ESXi in that case.
Once I've installed freeNAS under VMware Workstation to provide a common storage for ESXi. In that case even vMotion was working.