@hdagas
Although the forum rules caught your serial # and "X" out.. Never and I mean never share personal information here such as your serial #. This is a world wide user forum. In addition if you are trying to share your educational license file.. Please don't do that either.
Now to your problem.. There appears to be some issues about Mudbox 2018.. Autodesk doesn't even have it listed as a product under its 2018 product key listing. In addition since this is educational you will need to contact the Educational Support team and ask them.
Mark Lancaster
& Autodesk Services MarketPlace Provider
Autodesk Inventor Certified Professional & not an Autodesk Employee
Likes is much appreciated if the information I have shared is helpful to you and/or others
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