Possibly an installation mix-up. I have versions in a Win11 (VM) and go for the "for everyone" install in Program Files option.
Gimp 3.2 is still a development version and installs in ...Program Files/Gimp 3.1 That error message refers to Gimp 3
Using the gmic installer latest 3.6.6 seems to work here. I can see a libpoppler-glib-8.dll file size difference between the gimp 3.0.6 version and gimp 3.2 version 553,472 / 555,520 byte Perhaps check that and location of the gimp_gmic_qt folder.
Gimp 3.2 is still a development version and installs in ...Program Files/Gimp 3.1 That error message refers to Gimp 3
Using the gmic installer latest 3.6.6 seems to work here. I can see a libpoppler-glib-8.dll file size difference between the gimp 3.0.6 version and gimp 3.2 version 553,472 / 555,520 byte Perhaps check that and location of the gimp_gmic_qt folder.