Right-click the 3ds Max icon and select "Run as Administrator" before attempting to enter the code. This ensures the license file can be written to your hard drive.
As of , Autodesk has discontinued support and activation services for the 2015 and 2016 software versions. You may find that automated activation or manual requests through official channels are no longer processed for these older releases. Activation Problem - Autodesk Forums 3ds Max 2016 Activation Code
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