Here is all you need to get KiCad 7 running on Windows 7x64. Please note that 32 bit KiCad doesn't seem to exist, despite the name of the installer. Don't run "patch_all.bat" a second time (don't patch patched files), it seems to render the patched files unrunnable if you do, but won't hurt anything else on the computer. Just extract the installer again if you accidently do that.
Open the batch file in notepad or other text editor if you want to see what it does, or look up my older posts about KiCad 7 on Win7.
PATCH IS ONLY FOR KICAD 7.0.9!
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1. Extract the files from the KiCad installer with 7-zip. You can run it from anywhere, but the default location is C:\Program Files\KiCad\7.0. If you put it anywhere else you may not be able to open file simply by clicking on them.
2. Go to the root folder of your KiCad 7 install, this is the folder from step 1. This is the folder where will you see bin, etc, lib, share, and maybe other folders. Extract kicad_7.09_patch_all.zip directly into this folder, you should see 11 new files. Run the "patch_all.bat" file, it will will move and patch files as needed, then clean up the unneedded files from the patcher. Now go in bin and open Kicad.exe. If it opens, all is good. If it complains about a missing Library, proceed to step 3.
3. (If Kicad asks for missing library) You will find a file named "VC_redist.x64.exe" in your KiCad root directory, this is the installer for the needed VC++ library. Open this file and just keep clicking okay until it is finished. KiCad should Now open and run just fine, but each time you open it you will get a message about unsupported operating system.
That is about all there is to it, you now have a KiCad 7.09 installation which will run on Windows 7 exactly as it does on Windows 10. One bug, the I haven't got the freerouting plugin working on Win7, may be possible with some effort, I haven't tried yet.
With this patch, you should not get any warning about unsupported operating system, if you do you did something wrong.
If you need assistance with this, feel free to DM me, I'm on eevblog every day, but don't always check this subforum.
Ed