The Source Code of the program is freely available on the download page @ Sourceforge. You can also find there previous releases.
Download, usage and study and modification of the Luminance’s code is free of charge (under the GPL License). However, a donation is highly appreciated, if you think we are making a good job. We commit to make it better every release.
Linux users should ask their vendors for a pre-packaged binary.
Note for Linux packagers:
Some Linux distributions do not provide QtWebEngine, we provide a ready to use patch for switching to QtWebKit, please download and apply that patch if your distro is not providing webengine support in Qt5.
You can find the latest binaries for windows here:
Information about older versions can be found here.