You're going to have to uninstall each patch in order, then RH8, then reinstall & repatch in order, rebooting each time.
I uninstalled Robohelp 8, and then re-installed the application. When trying to access the project file I have been working on over the past 8 months, I keep receiving a cpd error and still receiving the error "projects are from a newer version of the program. This project is no longer compatible with this version, please make sure you have the newest version installed".
This is becoming very annoying because I need to access my files, any help would be greatly appreciated.