After installing Redshift via the Maxon App you need to open blender, navigate to plugins panel and install plugin from .zip file.
The plugin .zip file should be located in RS installation directory, which by default should be ProgramData folder: \ProgramData\redshift\Plugins\Blender\3.1.0\
Don’t enable the plugin yet.
Save preferences and restart Blender.
After that you can enable Redshift plugin in the preferences.
This was the 1st part of plugin setup.
Redshift needs ACES color space to work properly.