Maybe you should read that URL before you post it, because it saysThere are numerous references to using VueScan with a 64-bit OS when an
original driver does not exist. For example, see:
the opposite of what you say. The first post there explicitly says
"even with the Canon 64 bit driver and software."
There's also the issue that, as I posted, Vuescan's own author said
it needs the manufacturer's drivers.