Initially, when I tested a VB6 IDE install on an Windows 11 ‘out-of-the-box’ (RTM) install, I encountered no new issues. I just got a new laptop and tried the same install method on a 21H2 (Build 22000.376) and immediately ran into an issue. The install ended with a message it had not worked and a reference to an install setting. I had never seen this previously.
Windows 11 is here. The IDE was never officially supported on Windows 10 although I, like may others, have been using it there for half a decade. So, what about Windows 11? I have done an initial test using the rules outlined in my Running the IDE on Windows 10 post. The install went OK, the IDE runs and seems to work. Until I have done an amount of work, I cannot say more but it is encouraging.
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 to run on Windows 10. I have had no issues with the IDE on Windows 10 thru version 20H2. I only use the 8.1 installed IDE to generate final binaries (EXEs or DLLs) 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.