The DeckLinkPhotoshopHelper.bundle goes into ~/Library/Application Support/Blackmagic Design/Blackmagic DeckLink/
It should be automatically installed. But if you’re having problems, try reinstalling the drivers again. Do remember to uninstall the existing drivers by using the “Uninstall Blackmagic” tool before installing the new drivers to minimise any conflicts.
Regards
Kristian Lam
Blackmagic Design