For anyone interested, I adopted the original ShellOut.py to Gimp 3.2.4 for my personal use, but I share it in case others find it useful too.
Like the original, it can run any external program defined inside the listcommands function, not just Nik Collection. Also I fixed the broken behavior when a marquee selection is present, and I added a user-defined temporary folder in the plugin's initial dialog. It registers in Gimp as "ShellOut for Gimp 3.x"
Put it in Gimp 3's plug-ins folder, inside its own sub-folder. I've only tested it in Windows 10 with Gimp 3.2.4 and it seems to work fine for me. As always, use it at your own risk.
Like the original, it can run any external program defined inside the listcommands function, not just Nik Collection. Also I fixed the broken behavior when a marquee selection is present, and I added a user-defined temporary folder in the plugin's initial dialog. It registers in Gimp as "ShellOut for Gimp 3.x"
Put it in Gimp 3's plug-ins folder, inside its own sub-folder. I've only tested it in Windows 10 with Gimp 3.2.4 and it seems to work fine for me. As always, use it at your own risk.
Gimp & Stuff: https://www.deviantart.com/migf1