The automatic upgrade to Publisher 2.4.2 failed possibly due to file corruption so that software would not run. I logged into my Affinity account and downloaded the latest version available which is 2.4.1.
I attempted to uninstall 2.4.2 but that failed with an error. I therefore deleted all the Publisher files that I can find in Program Files, Program Data and AppData. I also deleted all references to "Affinity" in the Registry that I could find.
Attempts to install 2.4.1 continue to fail with error "higher version of this package is already installed". How do I fix this?
Update: I have fixed my problem by downloading the .exe installer.