The addin is very simple. You only need to do a few things.
1) Uninstall the software using windows add/remove programs
2) To remove the user interface (menus and buttons) from Visual Studio run the Visual Studio \resetaddin function as described here
3) Some registry items may remain and can optionally be removed by a person with suitable knowlege
HKEY_CURRENT_USER\Software\Visual Micro
NB: Item 2) can be used on its own to fix problems in some new installs with multiple user interface objects