Update to 90 was successful! Thanks!!you are OK on all, go to 90 straight.
(but not without some hiccups)...
Upon initial attempt, after the USB data validation step I received a message: Installation File Integrity Error
I tried with both the 90 and 85 updates using a 16GB flash drive formatted NTFS
I tried again using a different flash drive (4GB, NTFS) and it worked flawlessly.
Maybe the Magnetti Marelli system is temperamental with some flash memory hardware?
So, if anyone else gets that error message, try with different USB flash drives.