The widget cannot be repaired; the underlying Google Talk service is gone. The right action is uninstall and replace with a modern presence option if needed.
- Audit Installed Packages
Setup, Installed Packages. Search for Chatter Plus for Google Apps. If installed, note any custom Visualforce or Apex referenced.
- Remove widget references from page layouts
Open the affected page layouts (User record, sidebar, Chatter group pages) and remove any Visualforce or component reference the package added.
- Uninstall the package
From Installed Packages, click Uninstall next to Chatter Plus for Google Apps. Confirm and wait for the uninstall to complete.
- Verify nothing else broke
Check related custom code (Apex tests, Visualforce pages, dashboards) for references to package classes. Fix any broken references before deployment.
- Consider modern presence alternatives
Evaluate Salesforce Chat (Live Agent) for service, Slack-Salesforce integration for internal collaboration, or Microsoft Teams plug-ins for Teams orgs. Pick based on the org''s primary messaging tool.
- Uninstalling the package removes any custom code or layouts that reference it. Audit before pulling the trigger; broken layouts after uninstall are the most common surprise.
- The Google Talk service is gone for good. No amount of configuration in Salesforce will restore presence; the upstream API does not respond.
- Hangouts integration (the post-2013 Google product) was never officially integrated by Salesforce. Any references to Hangouts presence in old documentation are speculative, not productized.
- Modern presence integrations require their own licenses. Slack requires the Salesforce-Slack integration setup; Teams requires a third-party AppExchange package or a custom build.