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Keep the old version Installed and instead of running from the 0.6 folder run the game from the launcher found in the 0.7 folder.

What blasphemy... 

You should absolutely replay the game! It is way to good to be played only ones! 

But don't worry, the savefiles should be saved not in the folder but... Idk... In appdata or in the registry or somewhere? Anyway's, after installing the new version and launching it if you didn't reset your pc or somehow deleted those files as well it SHOULD just show your saves. But no warranty given if you completely deleted the game xD 

If you didn't delete your saved games folder, described in step 1 from my previous comment, they might be still there.

In this case, you only need to download the new 0.7 version and run it, it will automatically search for saved games in the default path.