I have an Arduino Uno (from China) and installed the 1.6.7 Installer on my 64 Bit Windows 8.1 Enterpr.
The driver seemed to be correctly installed, no errors in the Device Manager, Arduino serial port is displayed as working, I can set it in tools to the right com-port (as shown in device manager, see attached screenshots)
But no connection to the Arduino at all possible. Upload will fail after a while because of timeout (I guess).
So I tried the old 1.0.6, uninstalled the 1.6.7 and now it is working, I can upload my Sketches, hurra.
Then I downloaded the 1.6.7 zip-file (for not-admin purpose), unzipped it and it works perfectly (still with the 1.0.6 driver).
I want to keep it this way, because the 1.0.6 editor is buggy (e.g. setting font size bigger then default results in wrong cursor position, so maybe there are even more bugs then).
Is there any problems possible if I use 1.6.7 with 1.0.6 driver?
Or is this situation already wellknown?
Thanks for hints I am absolute beginner