...
Please remember to rename the files to settings.json and place them in the appropriate location. Before version 4.8.0, this functionality is not available.
LPVR-DUO
Upon installation of LPVR-DUO-Varjo the default configuration is created in the global configuration file %ProgramData%/Varjo/VarjoTracking/Plugins/LP-Research/LPVR-DUO-Varjo/configuration/settings.json, changes made by the user are stored in the per-user configuration file %LocalAppData%/LP-Research/LPVR-DUO-Varjo/settings.json. If the system administrator wants to make settings permanent for all users, they can make the changes in the web interface and then copy the per-user configuration file to the global configuration file location.
...