We have SQL Server 2008 R2 SP3 installed. Need to add a feature to the installation, Business Intelligence Development Studio. The question is do features installed after the application of a service pack pick up that service pack? If not does the service pack have to be installed again?
I would always err on the side of just installing the service pack again (it will know which components, if any, to update). Especially when adding client tools to a workstation - where this is not a major disruption. (And if you're adding BIDS to a production server, you should reconsider IMHO.)