You have Gimp 2.10.38 revision 1 - needed for the latest gimp_gmic_qt 3.6.1
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Small consolation, but the installer(s) work, make the correct folder in the User profile. Just check during the installation that the path to the plugins folder is correct. A two minute example (for those wondering).
https://i.imgur.com/A9JeV4G.mp4I have come across a user with similar problem but caused by migrating the old Gimp profile to a new installation. It might pay to clear both Gimp 2.10 and Gimp 3.0 user plugins folders and start adding plugins one at a time.
Remember for a Gimp 3.0 plugin it goes in a folder with the same name (minus extension) as the plugin.