To install gimp using Macports, you simply do Homebrew is similar to Macports and provides packages (aka formulas) to install, either by compiling them from source or by using pre-made binaries.
The flatpak build is new and has known limitations, though it will likely provide faster updates, following GIMP releases closely.Therefore choose your installation medium according to your needs.You may want to read the Release Notes for GIMP 2.10.To allow you to check the integrity of the tarballs, here are the hashes of the latest releases: GIMP help files are available at https://org/mirror/pub/gimp/help/.An easy way to compile and install GIMP and other great Free software on your Mac is by using Macports.
The installer allows you to choose from a large directory of packages.
Yet it may not work out-of-the-box on some platforms since the flatpak technology is new.
If that is the case, ensure flatpak is installed and if clicking the link still does not prompt to install GIMP, then manually install by command line: There is no mac OS package yet, sorry. Previous installers for OSX can be found here: org.
For instructions, how to build GIMP from source code, please see this page.
GIMP 2.10.2 is now available at https://org/mirror/pub/gimp/v2.10/.
Disclaimer: we haven't been able to determine if it is possible to install or build recent GIMP from Fink.