Hi Eric
Further to my previous post, the solution is as I defined earlier, build your VM using the 9.15 zip file and then upgrade it in the conventional way using the AC-MV-09.21.01.0179-1.ize image.
For convenience we have placed the zip image in the same location as the erroneous ova file, this ova file has also been removed.
Once again I apologise for any inconvenience.
Best regards
-Gareth