it doesn't look like appimages will be appearing on Gimp downloads anytime soon.
The gimp3 appimages are much improved carrying fusemount3 which makes them faster, they are on the backburner.
Looking at the last comment here the lead dev has some general issues about it.
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I figured-out how to get a direct link to the last appimage.
Make an image from an artifact, after you have gone thru the steps you get a link to your download.
I'm not sure how long these links last.
You don't need to be logged-in to do this.
The gimp3 appimages are much improved carrying fusemount3 which makes them faster, they are on the backburner.
Looking at the last comment here the lead dev has some general issues about it.
_____________________________________________________________________________
I figured-out how to get a direct link to the last appimage.
Make an image from an artifact, after you have gone thru the steps you get a link to your download.
I'm not sure how long these links last.
You don't need to be logged-in to do this.