I'm not sure what the problem is, although you are going about diagnosing the problem in the right way.
I would try not escaping the spaces, double escaping them (%2520), and also removing elements from the path (especially "/Systems" which does not seem to be necessary) until you can get a URL that works.
I've tried all of these suggestions with no luck, and many more
Hi Rich, permutations, both via the GUI and the virt-v2v command line. I had a look at your blog to see if I could use 'dcPath' but wasn't able to get something that I could use via vpx://. I've tried on a second VMware cluster with similar results. I'm tempted to try renaming the datacenter name to something without spaces, but I have to be careful there.
An alternative approach entirely is to use an OVA export:
Looks like that's the best bet for now. Thanks for the reply, Cheers, -Cam