After a long debate, currently the VAC and the EV Addin on the same machine isn't 100% supported. This is because of the many dependencies on the same DLL's. So if you move the client from 8 SP 2 (build 1693) and the VAC on 8 SP 2 (build 1693) and the client goes to say build 1713 you're sort of stuck. This is because there isn't a combination of installation that keeps everything at the right versions, so you end up left with the client blocking the install (if you try to install it after the VAC - that's been the case since back in EV 6) or if you install the client first then the VAC installation complains that a DLL is a of a later version.
This is something that I'm going to Etrack after discussion with the QA and Build teams, however, that doesn't mean it will progress quickly to resolution, just that it's "in the mix".
In the meantime I think the way forward is that the configuration is at the very least partially working. If you have everything at say 8 SP 2, then it works. (You install the client first, then the server). If you then want to upgrade to (say) 8 SP 3, when it becomes available, unfortunately at the moment, you have to uninstall both components and reinstall them. (Not very "pretty", but it will work).
Hope that makes sense,
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