win 8.1 upgrade - broken system

I upgraded to 8.1 - didn't expect a problem. Previously working Kensington K33928 failed. Read the support doc: Uninstall unsuccessful, (no displayLink software visible) tried the displaylink cleaner tool. Not clear whether it worked. (really needs a UI doesn't it?) Reboot Tried to install DisplayLink_7.5M2 It generates a popup that is too fast to read, then stops. So now I have apparently no displaylink driver installed, yet unable to install a new one. I have run DisplayLink Support Tool 1.0.0.19.exe: results attached. Any help gratefully received. Thanks, John

anybody? 

This issue has beaten me, I can't uninstall or install the displaylink software. This was a completely working system under Win 8.0, and the 8.1 upgrade killed it. Can I provide any further information than that contained in my original post? BTW when I wrote "Read the support doc" in meant "I read the support doc" (Just in case I sounded rude :)) Thanks in advance John