The K8055 works fine with the Windows 8.1 too.
You can download the latest DLL for the K8055 from this page: velleman.eu/support/download … 8055&type=
Download the “Complete SDK Pack (Rev 4.0)”.
The reason for my question is that I can not “connect” to the K8055 under Windows 8.1. The device manager shows an exclamation mark alongside the K8055 USB device when it is plugged in, and I receive a message in the Windows toolbar saying that there was an error finding suitable driver.
Note that the board works perfectly under my friends Windows Vista, but going back to an earlier version of Windows is not an option for me.
Does the LED LD8 do two blinks and then stay on when the board is plugged in?
This indicates that the PC has not successfully installed the HID driver for the K8055 card.
You may download the USBView or UsbTreeView and compare the results with the results in this thread: viewtopic.php?f=3&t=12338
See especially the last post (UsbTreeView result).
Do you see there: “Driver : C:\Windows\system32\DRIVERS\hidusb.sys” ?