Algor 1999 Algor 1999 ChiraL (Mechanical) (OP) 9 Oct 12 10:09 Hi, I am using an algor FEA package from 1999 and I am unable to select the analysis type as ‘nonlinear stress with nonlinear material models’. How can I get about with this problem? Thanks, ChiraL RE: Algor 1999 EngAddict (Mechanical) 10 Oct 12 01:09 You might have marginally better luck posting it here: http://www.eng-tips.com/threadminder.cfm?pid=810 Or at the Autodesk Simulation Forums: http://forums.autodesk.com/t5/Autodesk-Simulation-... However the package is not supported any more so I doubt you will find anyone who can remember or be able to load up the software on current machines (if they still have it). Do the other non-linear options work? Why not move to a newer release?