Sorry for the late reply. Thought about that but we have no clue when nothing is in event viewer or logged and permissions on your system are fine (as you say).
There is no msi installer that was uploaded and we have an updater that seems to work in 99,9999% of the cases.
What i could offer is a clean Beta 72 Windows client zipped and uploaded.
if that client does not run, then you run into next issue. I fear that your system has this case.
