Hi,
Is this a shared add-in (under Extensability). If so, using the generated setup project is the way to deploy the solution. It's a VSTO add-in we do have a Click-Once like deployment model, You can find details at:
http://msdn2.microsoft.com/en-us/library/hesc2788.aspx
Thanks and regards,
Darryn Lavery [MSFT]