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Connector Install 
Install Messenger for ServiceNow using the update set as follows:
- Download the latest update set here.
- In ServiceNow open ‘Retrieved Update Sets’ in ‘System Update Sets’ and select ‘Import Update Set from XML’  
- Choose the downloaded XML update set and upload  
- Open the upload set  
- Click to ‘Preview Update Set’  
- Select all “errors” to accept the import of missing references  
- Confirm update  
- Build your workflows 🎉