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Installing Unity 3.x and 4.x on the single machine

Unity announce it's latest version of 4.0 a while ago and revealed all the new features included in Unity 4.0 at Unity 2012. New great features includes
 - Direct X 11 Rendering Supports
 - New 3D GUI framework
 - Mecanim animation system and so on.

Unity is now offering the beta access to version 4.0 for it's licensee which pre-ordered the 4.0 license. If you're still using unity 3.x, it's recommended to not install Unity 4.0 as you might have to upgrade to all your projects done so far and you can downgrade the previous project once you've done upgrading of your project into version 4.0 . Here is the way of installing Unity 3.x and 4.x together for more comfortable uses of Unity 4.0

Note : Please do backup of projects before installing Unity 4.0 

Step 01

Rename your current Unity folder located in C:\Program Files (x86)\Unity to some obvious name such as Unity3_5 . To rename, just right-click the mouse and hit rename or you can just press F2 to rename the folder.

If you're using asset server or something related to your current unity build, you might get error of the folder used by other processes. In that case, download unlocker for windows here to unlock the folder that's being accessed from other programs such as asset and cache servers.

Step 02

Now you're ready to install Unity 4.0 and so just install Unity 4.0 as normal procedures and you're now ready to rock on Unity 4.0 . You might have to re-activate the previous Unity 3.0 license and of so just re-activated it back to use Unity 3.x for your current project.



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