We use AC 8.3 and that doesn't play nicely with Windows 10 (the server part anyway, the clients are fine). I just recently purchased a couple of laptops running Windows 7 in case Microsoft did something unexpected to Windows 10 and AC wouldn't run on it at all. Much to my horror, it appears the AC 8.3 installer no longer functions, as it has a dependency on obtaining a remote file from SAP for Crystal reports runtime. This is apparently not available anymore, so the entire installation fails.
Fortunately, I had previously had the foresight to install AC on a Windows 7 virtual machine for VMware fusion, so in the future if I have to run AC on Windows 7 on a new computer we can certainly just clone that. Otherwise we would be stuck, obviously.