This is probably a silly question but I need some help. I opened a file that I've been working on for about a month in the new 2.8 version of Blender. However when I tried to reopen the file in version 2.79, the scene is completely empty. Here is where the problem lies for me, I accidentally saved over the original file save while in version 2.8 . Please help. Thanks!
You can copy the polygons from 2.8 to 2.79. You will lose your node setup but at least you will get back your scene. This happened to me just now - I couldn't find any answers anywhere, so i figured it out myself. I thought of this because you can do the same in Maya too, so I thought: "must work with blender too".
Not a way to open a file, but the ability to transfer objects:
Just try Ctrl+C Copy to bufer operator on selected objects and then Paste by Ctrl+V in another instance of Blender. Works both sides with nodes and other prorerties.
From the v2.79 Release Notes
When using add-ons in Blender 2.79 that take advantage of the new data-block pointer properties, the resulting .blend files can't be opened in earlier versions of Blender. Attempting to open such .blend files in Blender 2.78c and earlier may crash.