If you're an administrator for your G Suite domain, you can centrally configure Screencastify for all of your users from the Google Admin Console.
Install Screencastify on all users' devices
- Go to your Google Admin Console
- Click "Devices"
- Click on the "Chrome" drop-down
- Choose "Apps & extensions" → "Users and Browsers"
- Click on the yellow plus sign in the bottom right
- Click on "Add from Chrome Web Store"
- Search for "Screencastify"
- Select "Screencastify - Screen Video Recorder"
- Click on "Allow install" drop-down and choose to "Allow install," "Force install," or "Force install and Pin"
- Click Save
Here's a quick video walkthrough: