A few example datasets can be installed via the OpenPolScope Installer. Additional sample datasets can be downloaded and extracted to their respective Mode folder under 'Samples' folder in the 'OpenPolScope' install directory.
eg. .../OpenPolScope/Samples/Birefringence/Aster/

Note: If the Mode folder does not exist then most probably the Mode plugin was not selected during installation and needs to be installed first using the OpenPolScope Installer.

Birefringence

Diattenuation