With Macro Scheduler 11 we will no longer support Windows 98. Macro Scheduler 11 will not install or run on Windows 95, Me or 98. There are a number of reasons for this, one of which is full Unicode support. Already some of the script commands cannot be used on Windows 98 because they make use of operating system features that did not exist back then. Furthermore, Microsoft stopped supporting Windows 98 in July 2006.
If you need to run macros on Windows 98 you can continue to use version 10.
Macro Scheduler 11 has been tested on Windows 2000, Windows XP (x86 and x64), Windows 2003 Server (x86 and x64), Windows 2008 Server (x86 and x64) and Windows Vista (x86 and x64).