Hello,

let's try to get a USB connection. Sometime Windows 8 installs the wrong driver from Windows Updates.
First you should uninstall the driver:
1. open the Windows device manager and look out for a device with the name "USB Serial Port" under COM & LPT
2. right click the device and click Uninstall
3. check the checkbox in the first dialog and click Ok.

Download, unzip and install the driver from here: https://aquariumcomputer.com/de-DE/g...ads?fileID=175
Restart your computer and try to connect via USB.