Windows 10 does not interface well with many programs yet !! And IF you update to windows 10, you CANNOT go back to windows 8 WITHOUT paying for the download which cost over 100.
FYI, while I was having a laptop repaired, the guys at the Geek Squad at best buy, told me NOT to download windows 10.
They told me that tons of customers are coming in, having problems with their programs once they have downloaded windows 10.
They told me to wait at least 6 months, come back and ask them if the bugs regarding program interfacing, have been ironed out.