I installed the latest QImage Ultimate after using the trial version, which should have included the plugins.
When this installed, it did say that it found Photoshop Elements 2018 and an old Photoshop.
I am using Photoshop Elements and when I go to Files-> Automation Tools, there is not anything there for QImage.
Pertinent screenshots that may help:
I do use plugins with the Photoshop Editor, but these are enabled by Edit-> Preferences-> PlugIns-> Additional Plugins Folder
I did not see anything in the QImage program file directory that looked like plugins.