Today I tried to install Framework Manager 8.4 on a new Windows 7 machine.
On starting the issetup.exe I got the notification “at least Windows 4.0 NT is required…….”.
Go to the folder containing the issetup.exe.
Right-click op issetup.exe and choose properties
In the properties screen go to Compatibility.
Highlight “Run this program in compatibilitymode for” and choose “Windows XP SP3
Click OK and try to run issetup.exe again.