In case someone else runs into this and hopefully saves them a few hours.
I just got VoiceAttack and VAICOM PRO, did the registration for VoiceAttack and enabled plugins, installed VAICOM, but I could not find the "VAICOM PRO for DCS World.vap" file to import, and it looked as if the plugin was not loading.
The problem was that VoiceAttack installed on "C:\Program Files" whereas VAICOM PRO was installing in "C:\Program Files (x86)"
So, when VoiceAttach started, it was not finding any plugins. I copied the VAICOMPRO folder over to "C:\Program Files\VoiceAttack\Apps" and then all worked fine. VAICOM created the subfolders and the profile file.
-Pablo