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NRF52840DK USB CDC driver error!

Hi. Does anyone know where I can download the CDC ACM diver for windows 7?

I am running the example on the nRF52 dev kit, but I get an error as windows can't find the driver.

project path:nRF5_SDK_15.0.0_a53641a\examples\peripheral\usbd\pca10056\blank\arm5_no_packs.

usb_drivers path:nRF5_SDK_15.0.0_a53641a\examples\usb_drivers.

now,the device have a nRF52 USB CDC Demo,but the driver fail.

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