I downloaded ~.ova’s for release 9 instead. Again, tried to follow instructions per https://www.whonix.org/wiki/File_Transfer#Transfer_files_from_the_Whonix_Workstation_into_a_different_Whonix-Workstation_through_a_VDI_file.
Got as far as instantiating a VDI on workstation 8.x and transferring my data to it successfully. However, I cannot mount the VDI to workstation 9.x. Followed instructions to copy VDI via virtualbox media manager, and added copy to workstation 9.x storage configuration. When I start workstation 9.x it does not recognize ‘sdb1’ ergo I cannot mount.