Support for the IDE ended in April of 2008. OS support ended with Windows 8.1. If you want to use it in a supported environment, you can keep a copy of Windows 8.1 around. I have both my laptop and Workstations dual booted to Windows 10 and 8.1 specifically for that purpose.
However, the IDE appears runs on Windows 10 through 1803. I have had no issues with the IDE on Windows 10. I only use the 8.1 installed IDE to generate final exe’s for clients.
Installing and running it on Windows 10 does require some special handling. There are links explaining this in detail so I will not try to do one more. I do find that many do not cover all the issues.