OK, it does rather look as if this is an awkward problem.

A couple of observations:

You shouldn't need to point to any driver location when you connect up
the the USB logger - it should self-install. If it doesn't then it's
an indication of something more basic wrong, perhaps with Windows.

Have you installed Weatherlink under an admin login? (If not then
there could be some obscure permissions problem).

If you run the 'CP210x USB USB to Serial Converter' which is a simple
utility found on the Windows Start menu in the Weatherlink group (and
'press any key to continue') then does it say anything other than that
the logger is already in serial mode?

If none of these give a clue then there are a couple of other options,
but I don't want to suggest those until you're tried the above.

JGD