This extension is used to enable communication with the GradeCam plugin via Native Messaging and requires installation of the GradeCam plugin to work correctly. Please see https://downloads.gradecam.com to install the GradeCam plugin.
If you need support please do not request it using feedback on this extension — this is just a helper which enables other functionality. If you are using GradeCam Go! you can get support from https://gradecam.zendesk.com and if you are using another system which uses GradeCam please contact them for support.
Again, support tickets for this extension will not usually be seen!