Is the version 12.00.90.00 of Intergraph SmartPlant License Manager compatible with Windows 10?
Unfortunately, I could only find older versions of SmartPlant License Manager and not the version that you're talking about, so I don't know whether it works with Windows 10 or not. However, I recommend contacting the developers directly using one of the solutions available on this page: http://www.intergraph.com/contact/default.aspx and asking them directly as they will surely be able to help you out.