I'm sorry but i think this is a bug !
The problem is that both VDM & EDM are named "Spark" in PT.
Note that you can remove Spark EDM.dpm & Spark EDM.dpm.rsr in
C:\Program Files (x86)\Common Files\Digidesign\DAE\Plug-Ins
This way you can load Spark VDM.
But it's impossible to have both in PT...
I sent this problem to the appropriate developer, know that a newer version will come in some time to solve this issue.