Why exactly do you need a 64 bit driver?
Snow Leopard runs 64 bit apps fine without running the kernel in 64 bit. If you're not running the kernel in 64 bit, a 32 bit DisplayLink driver is perfectly adequate.
The benefits of running the kernel in 64 bit are somewhat nebulous.
Some Macs with 64 bit-capable CPUs don't even support the 64 bit kernel because the machine has 32-bit EFI, or because the machine is on a hardcoded list of machines which don't support 64 bit kernel operation.
If you're booting the kernel in 64 bit, is there a reason why you're doing so?
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