You can use Studio offline, excluding this handful of features that requires an Internet connection:

• Signing in to InVision
• Publishing your Studio prototypes to InVision Cloud (See the "Publishing a Studio Prototype to InVision" section.)
• Creating a freehand from Studio (See the "Creating and Sharing a Freehand from Studio" section.)
• Mirroring your Studio prototype to the InVision iOS app or InVision Android app (See the "Mirroring Studio Prototypes" section.)