edit : I just download the latest USB driver from Roland's website, follow installation note and done. Interface is up and running. Didn't even touch the supplied CD driver.
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I just collected my new Quad Capture, unboxed, but not installed.

I noticed in the Quad Capture driver update (@Roland), the available download is a just a Quad-Capture USB driver version 1.5.0.

Whereas the Octa Capture have both USB driver 1.5.0 and system update 1.50.

..so just to confirm.. I do not need any "system" update for the Quad Capture right ?