Several users have noted that Ideal Flight (including older versions) continues to work properly even after upgrading to Windows 11, even though many other add-ons failed with SimConnect errors.
Windows 11 places SimConnect in a new folder called "\Fusion". Many add-on's don't access SimConnect correctly and that is why many add-ons failed to find SImConnect after upgrading to Windows 11 and have had to be repaired by their developer teams.
Ideal Flight is programmed correctly for SimConnect and does not care about where SimConnect is installed because SimConnect is a program that Windows takes care of and provides properly programmed applications access to it wherever it resides.