Essential libraries (like the Content Center for bolts/fasteners) are often stripped out to reduce file size. 🖥️ Original System Requirements (Win64)
Autodesk allows active subscription holders to download previous versions back several releases. If you have an active Inventor subscription (as of 2025), log into your Autodesk Account → Products & Services → Previous Versions. Inventor 2015 is available if you had access during its support lifecycle. autodesk inventor 2015 portable win64 full
If you need a legitimate lightweight or portable CAD solution, here are better alternatives: here are better alternatives: