Login to your cs-cart admin panel
Go to "Add-ons"-->"Manage add-ons".
Please click on the cog icon to open a list and pick "Manual Installation"
Click on "Local" and find the package you've already downloaded. Then "Upload & Install"
Find a Edrone CRM plugin on a list and click "Activate"
Click on the plugin itself to go to the plugin's Settings and provide app_id that you can find in edrone integration settings.
Make sure the plugin is "on"
Then click "Save" button(top-right corner). That's it, we are done!