| Error | Probable Cause | Solution | |-------|----------------|----------| | "Installation failed – .NET 4.5 required" | Missing Windows component | Manually download and install .NET 4.5 from Microsoft, then retry. | | "Error 1606 – Could not access network location" | Corrupt user profile or temp path | Clear %temp% folder and run installer from local drive, not a network drive. | | "Activation error – License checkout timeout" | Firewall blocking Autodesk licensing service | Add adskflex.exe and lmgrd.exe to firewall exceptions. | | "Setup stops at 98% – C++ Redistributable error" | Incomplete previous C++ install | Uninstall all Visual C++ Redistributables via Control Panel, reboot, and run installer again. |
To ensure a smooth installation, perform these preparatory actions: Autocad 2016 Installation