I'm happy to have helped you 'aka_tom_w'.
For the others, here is a more detailed 'how-to' :
When file downloaded from Apple site and mounted (should be done automatically), you find on your desktop a disk image containing the install program provided by Apple. The name of this virtual disk is 'NVIDIA driver Update'. Lauch TomeViewer and select menu 'File/Open...'. With the file chooser, go to the desktop, then disk 'NVIDIA driver Update', then folder 'Installer Files', then 'NVIDIA Driver Update' and finally folder 'Installer Files'. Select the file 'Tome' and click 'Open'.
A window displaying the 6 driver files should appear. Select all the files (Cmd-a) and click on the upper left icon of the window. Choose the destination folder and click 'All' (if you already have made a copy of your former drivers, you can directly select the 'Extensions' folder of your 'System' folder).
That's it.
MM