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Unity opens old version of project.
Just last night I was working on my first ever unity game I saved and built the game, the build is working great and has the updated version but when I open the project in unity it shows a sphere which was later changed to a cube but even stranger all my assets are here like audio and code but the mesh 's and lights are gone, what happened?
P.S. (Could this be because I saved the Project but not the Scene? Also I have already tried to reimport all assets.)
It does sound like you didn't save the scene. Saving the Project does not save the scene (I've made that mistake before as well). Generally when I save I always first save the scene and then the project, unless I have a specific reason not to.
Also you should get in the habit of saving your scene frequently. When playing in the editor you are vulnerable to having the editor appear to freeze, such as if you accidentally get a script into an infinite loop. You could lose all your recent work. When building there is also a rare chance of the editor crashing, again losing your work. So it is best to save before even hitting play in the editor, or at least always save the scene when you've put enough work into it that you would hate to have to redo it.