GIMP Version: 2.10.13
Operating System: Windows
GIMP Experience: New User

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Today I wanted to try the filter G'MIC / Stylize and in the field "style", I can only use the first 2 choices:

and for others I have this kind of message:

As you can see the preview error says "Unreachable network file", you can't access the style_udnie.png image in the gmic.eu website.

That is the image for Stylize/Picabia: Udnie
The uppermost 2 styles, custom style bottom or top layer do not require network connection, that's why they work.

I don't know how it works, tried to search if those style images are downloaded on the HDD, but did not find anything in the .gmic folder or temp.

Did you click the "update filters" button after installing 2.7.2? if you can update filters it would be strange that you couldn't use stylize.
Maybe you have so strong firewall setting that it prevents downloading the stylize filter images from gmic.eu?
Just guessing, cause I'm using Linux, no problems here Gimp 2.10.12 Gmic 2.7.2.
You're using portable if I'm right, so that might be the issue.

Nidhogg

When I use Gimp I'm rarely connected

Hmm, I don't see any reason in being disconnected when using Gimp.
Glad it got solved anyway.

When I do not need to go on the Internet (for example when I use Word, Gimp or Spider ), I do not open my Wi-Fi connection.

Plenty good reasons not to be connect to the internet all the time. Back in the days of expensive / slow dial-up ISP's most work was done off-line.

Hint:
While gmic needs a connection if you use the the stylize dropdown menu, the image file style_some-name.png ends up in the gmic folder ...



for samj it is ...\GMIC_Filters\gmic
Regular Windows Gimp 2.10 ... C:\Users\"yourname"\AppData\Roaming\gmic
Linux ~/.cache/gmic

Not connected? You can use those files and add to your image as a layer then use the stylize Custom option.

rich2005

Yes I found the viewed images in: D: \ Gimp-2.10.13_Portable-32-64bit-Win-V2 \ GMIC_Filters \ gmic