In Xcode 6 you would click on Xcode -> Preferences -> Account -> View Details -> then there would be a little circular arrow. That is gone and there is now a \"Download All\
I had this issue with a workspace containing multiple projects in XCode 7. My developer certificate had expired so I needed to get a new one and reassign it to my provisioning profile. This ended up being a major problem because the expired provisioning profile kept rearing its ugly head and would not get updated automatically. It was in fact listed in XCode->Preferences->Account->View Details twice (where, I might add, there was no refresh button and no contextual menu). Nothing I did made it go away and XCode kept asking for the wrong provisioning profile.
I finally solved it by deleting all of the profiles in ~/Library/MobileDevice/Provisioning Profiles, opening the workspace in XCode 6 and using the refresh button that DOES exist in XCode->Preferences->Account->View Details.