Regular Chromebooks require kiosk mode available to install kiosk applications
Verify that kiosk mode is available:
If there is a button called "Manage Kiosk applications" you can continue to install the Inspera Assessment kiosk application
If this button is not there, you have to reset your Chromebook to factory settings.
Follow the instructions at https://support.google.com/chromebook/answer/183084 to reset the Chromebook
Make kiosk mode available:
Install the application from https://chrome.google.com/webstore/detail/inspera-assessment-lockdo/jpaaknbngjmabmjefmfpglmpkllcidbg
Make Inspera Assessment available as a kiosk application:
To use the application - log out and start the application from "Apps" next to "Shutdown"
Read more here: https://support.google.com/chromebook/answer/3134673
Enter this URL: https://chrome.google.com/webstore/detail/inspera-assessment-lockdo/jpaaknbngjmabmjefmfpglmpkllcidbg
Use this ID: jpaaknbngjmabmjefmfpglmpkllcidbg
The users in the chosen organisation should get access to the application within one hour. If it takes longer, it might help to restart the device.
For more details: https://support.google.com/chrome/a/answer/1375678#kiosk