No Design Tab in Inventor Professional 2015
@Anonymous
Welcome to the Autodesk User's Community.
This type of question should've been asked over in the Inventor Forum. This forum is only for installation and licensing issues. You are getting into specific details about a given application. Also its not our site that you downloaded the software from.. The software and site belongs to Autodesk. We are only users here (its a peer to peer network) and wanted to make sure you understood that in case you thought you were speaking to Autodesk. 
Now to your problem.. Are you in an assembly mode? If you are in a part mode you will not see the DESIGN tab. Make sure to start an assembly to access the "DESIGN ACCELERATOR" functions or see the "DESIGN" ribbon tab.
One final thing.. A student copy is the same as a commercial or purchased version. There's no difference except students get it free for 3 years..
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
Did this resolve your issue? Please accept it "As a Solution" so others may benefit from it.
Hello @Anonymous,
Educational software is a complete version of the software nothing should be missing. I will move this post for you to the Inventor forum.
Natasha
Community Product Support Specialist
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Accepted solution
Hi! Design tab is available in assembly document. You will need to open an iam file or start an new assembly file by selecting an assembly template.
Many thanks!
Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer