That strategy didn't work well with me: I "upgraded" to Windows 10, and less than 48 hours later, went back to Windows 7. Windows 10 was a nightmare, where half of my programs wouldn't run, and the others ran strangely. Who
needs that??? With all its annoyances, at least Windows 7 works!
The cool thing about that is that although you did go back to W7, you now have an 'entitlement' license for W10. Provided you have no major hardware change, such as a MB, or several other components (would require a lot to deny the license), you can clean
install the W10 edition that was on the computer (Home or Pro). There's a chance that an upgrade would also work, provided the Windows COA is the same as when W10 was on the computer.
Though I tend to distrust Microsoft a bit, so I upgrade, run a couple of days, then create a drive image, this way the entitlement isn't 'forgotten'. With 8.1, this is 6.5 years away from EOL, with W7, more like 3.5 years from the date of this post. A lot
can happen in either amount of time, especially for current 8.1 users & that's not a bad OS, just gained a bad rap from being associated with the initial W8 release.
So you have made a positive step forward. ;-)
At any rate, I've found the instructions posted a page or so back to work fine. Yes, it's an over 500MB download & may take 2-3 hours to run (less if on a SSD and/or plenty of RAM/powerful CPU), but it gets the job done. What I do beforehand Is set Windows
Update to download & notify me then reboot (the latter step is important), because sometimes updates not compatible with our OS (or undesired update) will come through. It's best to physically see & check the non-security updates to see what it's for, there's
a link to the right after clicking onto the update for details, and you can 'hide' the updates you don't want by right clicking & choosing that option, even after these has been downloaded. Of course, install any security updates offered. Usually these are
listed before the non-security ones, and if not been updated for some time, the list will be long.
Choose the 32 or 64 bit Windows 7 link that applies to you & download. Do not discard after successful update, may again be needed, I had to go though this two times on one W7 computer, after I had also ran the sfc /scannow tool three times as recommended
in an article I had read.
This step applies to Windows Vista and 7 users only.
To get started, download the System Readiness Tool (hotfix):
Once the file is downloaded, run it and follow the onscreen instructions, then try Windows Update again.
This tool is updated from time to time, if you have tried an older one, maybe it's best to try the latest. Once opened & it's checking, provided the computer isn't set to sleep after so long (if so, disable for this & be on AC power), you don't have to babysit
it, run errands, whatever you need to do, when it's ready for install, it'll be ready for you & post install, open the Task Manager, the Internet activity lights up as though a Christmas tree & you'll get a Windows Update notification. Or may see an asterisk
at the shutdown option, this partially installs updates, though has to be restarted & rebooted again to finish.
The only thing about the shutdown to install updates option is that you don't see what's been updated & may have to uninstall some unwanted ones. Example, you have opted out of Telemetry updates & these keeps coming in. Windows 7 'phones home' almost as
much as 8.1 & 10 does, and to an extent, so does Vista.
I once recommended this as an answer, seems that many has missed the post on Page 5, have personally fixed 25-30 user's computers (not counting my own) with this option. The only drawback is that it takes time to run the checks, and when running for that
long, must be doing lots of it. When ready, you'll be notified to install, and it'll open up just as any other Windows 7 update box does. No reboot required post install, and often, many of the updates has downloaded if it's been ready to install for a spell.
Good Luck, I hope this repost of my last one helps many!
Cat