Even after a successful installation, you might face an "Internal Error" during activation. This is often caused by the retirement of the older activation servers.
Temporarily disable User Account Control (UAC) if you're on Windows. autocad lt 2015 download fix
to see if your legacy 2015 serial numbers and installers are still listed under "All Products and Services". Autodesk Community, Autodesk Forums, Autodesk Forum 4. Post-Install Troubleshooting Autocad 2015 locks up on start up - Forums, Autodesk Even after a successful installation, you might face