Is it supposed to work? It is not listed in the help text window, but is accepted.
I was trying to use the update option to go from the 9.01.0100 to 9.03.0400 driver on a 64 bit windows 7 machine.
It works for the 32 bit driver, but not the 64 bit driver.
The 32-bit update, removes the Program Files (x86)\0901\bin directory, then installs the 9.03.0400 driver in Program Files (x86)\0903\bin.
The 64-bit update, removes the old files from Program Files\0901\bin, then incompletely installs the 09.03.0400 driver in Program Files\0901\bin.
Thanks,
Keith