Yep, I see this thread as a way to post a problem and give a solution or workaround of it now.
I know the problem of the update loop. If the DL is incomplete or aborted it will start again and again indefinitely. They really should invent a way or a software vehicle to allow a big update to be downloaded in small chunks depending on the user's connection. When they spread the huge 3 GB update at the beginning of the year (which took me completely by surprise) my high speed volume was obliterated in a few minutes - without actually benefitting from it.
After one day with Win10 I encountered some trouble regarding the safe removal of USB devices. Card reader was not affected but everything I connected via USB. This may have been m fault because right after the upgrade I uninstalled a bunch of programs which I would not need (including Nero BackItUp which was on my system taking up space). I may have removed some controllers by doing so, who knows. I'm eager to find out later.

Well then, I found several similar reports on various forums. The solutions ranged from simply rolling back and starting anew to completely wipe the system and make a clean install. I used the simplest way: System restoration. I went back to the point at which the "Intel drivers" were installed (the first restoration point my system offered). After running the restoration everyting was fine again.
Concerning Aero: In my enthusiasm I did not recognize that only the Windows programs' frames were transparent, not the frames of other apps. So I must assume that it does not work properly. I deinstalled it and am looking for a fix or an alternative (there are some).
A big problem occured with Firefox: Scrolling a website had some weird effects because about one cm of the top page was displayed on the bottom of the page. This lasts only for a millisecond but caused the page to jitter. Solution: I deactivated hardware acceleration in the Firefox properties.
One of the main buggers I am experiencing is that I am unable to calibrate my monitor. I'm even unable to change the brightness of it using the keyboard shortcuts. I guess I need some new drivers; I skipped the "look for updates and new drivers" at the beginning of the upgrade because I'm surfing at 10 kbs at the moment again. (To my surprise my copy was activated without problems when I connected to the web again.)
Being registered, I can try anytime I wish and the deadline does not apply to me.
Yep. You may skip back and forth as you wish and then stay with Win 10 when support for 7 is no longer available. That was my strategy, too.
you have a very short period to revert to your previous O.S.!!
If you have made a backup of your previous OS you may extent that period "a little" longer.
