PowerCLI C:\Program Files (x86)\VMware\vmware workstation\ovftool> .\ovftool.exe C:\x\vc\VMware-vCenter-Server-Appliance
Opening OVF source: C:\x\vc\VMware-vCenter-Server-Appliance-18.104.22.16824-472350_OVF10.ovf
Warning: No manifest file
Opening VMX target: C:\x\vcsa\vcsa.vmx
Writing VMX file: C:\x\vcsa\vcsa.vmx
Disk Transfer Completed
Use the ovftool to register it from ovf. Also be sure to check if the disks were downloaded ok from vmware.com. Not sure why, but my data disk for VCSA was not ok when downloaded from vmware.com using their download manager. I have downloaded it again using my browser and it worked.