This release completes the 3.4.2 series. For changes since 3.4.1 see https://github.com/Duet3D/RepRapFirmware/wiki/Changelog-RRF-3.x#reprapfirmware-342. For changes since 3.4.2RC3 see https://github.com/Duet3D/RepRapFirmware/wiki/Changelog-RRF-3.x-RC#reprapfirmware-342-post-rc3.
Users running Duet with attached Single Board Computer, please install this update from the Duet3D package server as usual. Other users can upgrade using the files here.