You can find the Unity 3D free editor download link to the 3.5.7 version in the following lines. If you own a Unity 3.5 valid license you must continue to use the Unity 3.5.7 version wich will be the last updated Unity version that will work with your license. Please note that if you wish to update to Unity 4 you should get a new license, and you should be aware that there is no backwards compatibility from Unity 4.0; projects made in 4.0 will not open in 3.x. However, Unity 4.0 will import and convert 3.x projects.
One of the main advantages of the method is that it avoids any need for remeshing or geometric crack modelling in numerical simulation, while generating discontinuous fields along a crack and around its tip. The second major advantage of the method is that by a small increase in number of degrees of freedom, far more accurate solutions can be obtained. The method has recently been extended to nonlinear materials and other disciplines such as modelling contact and interface, simulation of inclusions and holes, moving and changing phase problems, and even to multiscale analyses. 2b1af7f3a8