Thank you for the link. I actually went through that page as well. I basically wanted to download some portion of World Imagery base map from ArcGIS Pro 2.0 which seems not to be supported right now as it gives me "The layer type is not supported in runtime content: Map/World Imagery Failed to execute (CreateMobileMapPackage)." . Do you know if we can download similar basemaps in anyway from ArcGIS Pro?
You could take look at the Tile Package Kreator application for downloading world imagery (or other ESRI basemaps) as tiles packages (disconnected or uploaded to AGOL). See Tile Package Kreator | ArcGIS Blog or https://marketplace.arcgis.com/listing.html?id=9c9ddae83e5549bb88a2c22e87a18ba1
It seems one can only create Mobile Map Packages from vector data.