You have nothing to worry about!?
I did download Windows 10 the very first day it was available July 29.?
It is very good, better than Windows 7 which I was running before.?
It comes with a lot of new nice features. The best part of it is that it was free and it will be ?free till the end of the remainder of the year July 28 2016.?
Consider also the fact that support for Windows 7 will end, they did not announce the deadline yet, ?but it is coming.?
The Start button is back, so what are you waiting for????
One tip! The download takes a little long, it took me about 2 hours, but, all depends on your system. ?The amount of RAM you have, and the speed of your processor.?