Aaaaagh, so near, yet so far. I'm on a modest 32-bit W7.
Looking frantically to find the 32, but me being a tyro . . .
This bizarre form shows the driver, W7 32 V 64. Every single one shows compatible with both. Who does the thinking in these support sites? So, trying the 64 bit.
SOAOTH-70193336-US.EXE
School run due. Back later.