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I was experimenting with the file in 2.8 as habit of saving i saved the file. When i open in 2.79 i cant see my model disappeared with the error " File written by newer Blender binary". How can i get my model. I can see my model in 2.8 but nothing in 2.79. I tried to export in .obj. But i lost all my modifier and material camera setting. Save as in lower version no option for it. Any suggestion or help.

Restore your file from a backup. Check whether there is still a .blend1 or .blend2 next to your .blend, or pick a backup from another source.

If you didn't make backups before using a Blender 2.80 beta, you'll probably have to manually restore by trying to copy-paste bits and pieces between 2.80 and 2.79.

Note that the download page said Do not use in production nor save important files with it for a good reason.

I find the easiest way to get an object back into 2.79 is to append the object. After starting 2.79 (a new file not after opening the 2.80 file), choose File->Append and select the object from the 2.80 file, this brings in the object, modifiers, mesh data, materials and animation.

Directly opening a 2.80 file with 2.79 fails to read object data, you will find the mesh, materials and action data is there.

After opening a 2.80 file in 2.79, add a new object, in the mesh properties change its mesh data to use the original mesh data. Materials are usually associated with the mesh, but if not you can find the material in the materials list. If you go to the action editor (mode of the dopesheet) you can also select the action associated with the original object. Actual object data will be lost, such as modifiers.

As most addons are not working yet, we only have two export options in 2.80, collada and alembic. Both can export data that can then be imported in 2.79, when exporting you want to make sure modifiers are not applied so that you can re-create them.

If you can still see your model in 2.8 you should be able to just append it over to your 2.79 file by opening it (in 2.79) and appending it as an object from the 2.8 version file.