Updating to 1.8.3

Been running 1.8.0 for a couple of years (installed for all users) and tried to update to 1.8.3. It did not ask for an install location and installed to my user directory. It doesn’t know where the configuration files are and I don’t see how to point it to the correct location. I’d really like to install it (and overwrite 1.8.0) for all users so I can use it as a service. Any pointers on how to do this?