https://forums.autodesk.com/t5/installation-licensing-forum/intallation-of-autocad-2015-stops-in-a-middle/m-p/5726018#M139747 Thank you for trying to help. I watched every video and followed every step. I also tried to install it on-line(from the Autodesk site) and off-line install. Nothing helps, every time the installation process reaching the part when it starts installing Autocad, same announcement appears and stops the install Maybe you have another solution? By the way I'm using Windows 8.1. Sat, 18 Jul 2015 17:58:53 GMT Anonymous 2015-07-18T17:58:53Z