I don't have it installed i use the portable versions.
Because the two libintl-8.dll files are both different in Gimp-2.6 and Gimp-2.7 versions this is probably causing the error yes.
Like Jacek said, this version of delaboratory is looking for gimp-2.7.exe in the path. If you have Gimp (any version on your Windows PATH), then simply make a copy of your current Gimp executable, and rename the copy to gimp-2.7.exe. You will be all good to go. If not, drop me a line. This is similar to Linux/Unix symlink since Windows does not have symlink.
I do compile it but i never keep it installed.I just keep the compiled copy in my Opt folder.
Parthas versions (installers) are much better so i never release mine.
I am honored.