No luck here
The archive files unpacked to an .iso file too large to fit on dvd-R disk, and it appears to be designed to be loaded onto a hard drive.
I tried 2 separate downloads and unpacked them with both Winrar and 7zip.
In all 4 cases the resulting .iso file size was 4,667,552 KB
Then looking at this .iso file with a hex editor showed that it started with large blocks of 00 bytes with "Smart storage Inc" labels.
Further in was the text "TOYOTA" and "LEXUS" and some stuff about loading the HDD with an external HDD tool.
Then came some interesting stuff about "FRONT ELECTRIC MOTOR", "REAR ELECTRIC MOTOR", "FUEL CELL", "FCHV ERROR DETECTED", and "The hydrogen level is low. Please refuel immediately."
So this appears to be in a different format and not suitable for our now old technology Prius.
However, v20 torrents are now starting to appear, so there is still hope for a valid update soon.
Bugger. - There is also an .iso torrent file "Toyota-Lexus WhereIs v20 AU-NZ 2014" on other sites which I found to be just the same and just as useless.