I've installed GhostDoc Pro into VS2017 successfully using the vsix installer. When I attempt to register it, it appears to succeed, but when I restart Visual Studio I find that GhostDoc has reverted to being unregistered. We run Visual Studio as normal users without Admin privileges, so I suspect registration is trying to write to somewhere my account doesn't have access to. Typically in these sorts of circumstances it's a registry key, but I don't want to guess too much at your registration mechanism.
We've been GhostDoc users for a long time, and this has never been a problem with the exe installer.
I can log in as the local Administrator if required in order to apply a workaround, but registration must succeed for my normal, low privilege account. Can you help me out please?