Just came across this issue today with a new ARM64 MacBook Pro 14" and thought I'd have a crack at trying to build a customised driver for it before I found this thread
The latest Silicon Labs universal driver for the CP210x chips (10.1.10.103) supplies binaries for x86, x86_64 and ARM32 / ARM64
The driver bundled with PCLink appears to be the slightly older 10.1.3.2130 and only supplies x86 and x86_64 binaries as stated
I modified the 10.1.10.103 driver manifest to include the Link USB vendor/product IDs and disabled Windows driver signing and it seems to work like a charm, though I only played around with it for 5 minutes
Picture of PCLink running on Windows 11 ARM64 virtualised under MacOS Monterey 12.0.1 attached
@Adamw I know that MacOS support has specifically been ruled out, but is there any chance of the universal Silicon Labs CP210x driver version 10.1.10.103 being rolled out with a new PCLink release?
Having the driver properly signed would be awesome and make the process painless, as well as adding support for real Windows ARM64 devices which are bound to become more prevalent in the next few years