Updated my Toshiba Satellite notebook, which is 4 years old, original Win 7 64bit machine. No problems, yet. Went smoother than the original up grade to Win 10. I did have the start menu problem, TWICE, on here, where the only fix that would work was a reload of Win 10. (returning to Win 7 wouldn't work.) Both reloads updated me to the next release of Win10, and had everything working properly again. Never lost any software, although I did have to reload one or two items to get them back in the registry. I do keep ALL my programs on a separate hard drive, as well as most on DVD disk. I DO always disconnect my external drives, used for FS storage, for all updates. My FS machine (in my sig) would not update to Win 10, (on the last day of free update,) until I disconnected ALL the extra INTERNAL drives. Turned out one of the HDD's was going bad, and for some reason the update kept wanting to boot to that disk, which wasn't even a bootable disk. It was also causing memory problems. Once I unplugged the internals, except C:/ drive, everything went smooth. These were all upgrades, not fresh install, (which was going to be my next attempt. I did NOT want to do that.) After the upgrade, I plugged everything back in, and that's how I found the bad disk. Everything else seems to be working fine, so far.
Your mileage may vary.