Hi @alain
Had no luck reproducing your fault. I installed on a virtual machine running Windows 11 Professional that had prior GIMP 2.10 and G’MIC 3.5 installs. I did “basic uninstalls” followed by using Windows installers for GIMP and G’MIC. Apart from being a virtual, I don’t think this setting is far different from your own.
By “basic uninstall” I mean:
- Start button ⇒ “Settings”.
- Navigate to Apps: “Apps” ⇒ “Installed apps”.
- Find G’MIC in the list.
- Uninstall: Select “More” and then “Uninstall”.
Repeated for GIMP 2.10.
I followed this basic uninstall knowing that it leaves certain plug-in, profile and configuration files behind; I wished to see if such would interfere with follow-on installs in a manner that you reported.
Then I installed GIMP 3.0 This is 3.0.0 as of 2025-03-17. Following installation, a log-out and a logging back in, It started up normally without the G’MIC plug-in.
Then I installed G’MIC-Qt plug-in for GIMP 3.0, using the Installer .exe
Logged out; logged back in again. Then started GIMP. It started normally and the G’MIC plug-in was available.
So — I don’t have a known-to-work fix for you. I suggest uninstalling G’MIC completely, a three-step process. (1) Remove G’MIC through the Start menu, see above, then (2) Find the directory where GIMP plug-ins are installed (something like C:\Users\"yourname"\AppData\Roaming\GIMP\3.0\plug-ins) and (3) remove the gimp_gmic_qt sub-folder in that directory, if it exists.
Start GIMP, ensures that it runs and that G’MIC is no longer in the Filters menu.
Do a fresh install of G’MIC.
If you acquired GIMP 3.0 before 3/17, you might also consider a complete uninstall and re-install of GIMP as well; certain bugs have been cleared up with this 3/17 release.
Sorry I couldn’t be more informative. Hope this helps.