KDiff3 1.10.0 has been released.
It can be found at https://download.kde.org/stable/kdiff3/kdiff3-1.10.0.tar.xz.mirrorlist This tarball includes translations. The windows and MacOS updates have also been released https://download.kde.org/stable/kdiff3/kdiff3-1.9.6-windows-64.exe.mirrorlist https://download.kde.org/stable/kdiff3/kdiff3-1.10.0-macos-64-en.dmg.mirrorlist For Windows users the new installer is generated from source tarball and will include all translations. I am unable to do the same MacOS so this remains English only with partial translations from Qt/Frameworks. I have no means of producing a macos 64 bit binary locally
