You can download LuminanceHDR W64 nightly builds at
https://keybase.pub/gaaned92/HDRNightlyBuilds/
I update the build of branch master from time to time when I am aware of changes.
If you need a build from an other branch or an update, don’t hesitate to ask for.
02/01/2019:
Luminance-HDR_master_v.2.5.1-340-g5df87a92_WinVista_64.exe uploaded