https://forums.autodesk.com/t5/installation-licensing-forum/autocad-2015-install-win-8-1-pro-failure/m-p/5799231#M135672 <P>Could you upload the log file from the install located in %temp% please.</P> <P>&nbsp;</P> <P>I have a feeling your issue maybe related to the following Autodesk Knowledge Network article... <A href="http://knowledge.autodesk.com/customer-service/installation-activation-licensing/get-ready/prepare-system/net-for-windows-881" target="_blank">http://knowledge.autodesk.com/customer-service/installation-activation-licensing/get-ready/prepare-system/net-for-windows-881</A></P> <P>&nbsp;</P> <P>Regards,</P> <P>&nbsp;</P> <P>Duncan</P> Wed, 02 Sep 2015 08:00:25 GMT ukdxb012 2015-09-02T08:00:25Z