This issue is resolved. 

Just deleted the manifest and .ovf file. Started the wM Ware with the Pega image ( which is ~ 5GB).

It worked.!!..   I am able to launch the Pega server and able to work on the exercises.  

Thanks

Subbu 

Ensure you save the file as an .ova file type. Most browsers in Windows try to save the file as a .tar, which will not work - because folks then try to unzip it and run the .ovf file directly.

See the VM user guide; it gives details for how to correctly download the VM.

eddie 

I am also facing the same issue. Can you please help me in resolving this issue with the clear instructions to follow. 

Thanks in advance.!

See my reply above your post. When you save the download file, ensure the file extension is set to .ova before you download and save the file.

eddie