As of this date, InduSoft still in the process of getting Microsoft “Certified for Windows 8” for InduSoft Web Studio SCADA software. However, this will not stop you from using InduSoft Web Studio in a Windows 8 Environment!
If you need to use it or develop with it right now, InduSoft Web Studio will install and run properly on Windows 8 (RT is not recommended, as it is for small footprint devices).
In addition to using Web Studio on Windows 8, there is the InduSoft SCADA Visualization Manager App (Thin Client) for Windows 8 and Windows 8 RT available (free download) in the Windows 8 App Store.
Here is a Blog about using InduSoft Web Studio in a Windows 8 environment.