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Autodesk Virtual Agent does not have any older versions of Inventor HSM, which is compatible with Inventor 2013. Upgrade to version Inventor 2015 is not possible because the whole Secondary school for mechanical engineering is using Inventor 2015 for learning.
Is HSM for Inventor 2013 accessible?
Yes, only Inventor 2014 and later are supported for Inventor HSM as it uses features only introduced in Inventor 2014.