I have an InstallScript function that runs fine when running during the install that I need to run during an uninstall. It is backing up the existing applications. I created a Custom Action for it and added it to the Execute Sequence after InstallValidate.
There is no log file generated, as far as I can tell for uninstalls, so I am having trouble figuring out why it fails with a “Feature Transfer Error” -1603.
I am pretty sure the function is not being called as I put a MessageBox as the first thing.
You should set the Install UI Condition or Install Exec Condition to
just in case you have or will in the future have multiple features being installed. (Unless of course, you only want to run the Custom Action in the case where the whole product is being uninstalled)