Go to the AppExchange and select Get it Now from the Overcast AppExchange Listing. Select Install for Admins Only and Install.
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You will receive a prompt to Approve Third-Party Access. These security settings give permissions to the Overcast App installed on your Salesforce org to contact the Overcast Server endpoints that are required for communication to and from the backend. Once you select Yes, grant access to these third-party web sites, you can then select Continue.
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In the Setup Quick Find, search for Installed Packages. Confirm the Overcast Package has been installed.

Navigate to the App Launcher and select Overcast.

Select the Settings tab, and choose your Overcast Endpoint (i.e the overcast server in you region). If this is for trial use in a Sandbox, please select the endpoint that properly reflects both your region and contains the sandbox denotation (i.e. "US1 (Sandbox)"). If the endpoint is custom, provide the URL for the endpoint. Once saved, the endpoint should not be changed. Changing the endpoint after it has been established can lead to malfunctions with Integration Scenarios.
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Select Save at the top of the page. You should see a confirmation message.
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Overcast has provided permission sets that are required for users to have access to parts of Overcast, including components.
For more information on Permission Sets, click here.