I am currently rewriting the installer for my application with advanced installer. The application does not appear to have a GUID. The NSIS installer used previously checked for a different registry key, which had the install path as its value, to determine if it was an update.
How would I go about setting up updates for an application that does not have a GUID? Advanced installer looks for an Upgrade code, but the application I am trying to update does not have one. In this case, I would need a way to check if a registry path exists to determine if it is an update, and update to the path specified in the registry key. But i am not sure how to do so. Any guidance would be appreciated.