Follow next steps:
Make sure the application is closed.
1) Put new version fólder (version 1.6) where you prefer on your pc.
2) Move old data folder (version 1.3) inside new version folder beside .exe file (replacing all data if necessary).
3) Create a desktop shortcut on desktop to new version.
4) Delete old data folder (versión 1.6) after check all works fine.
And it's done.
Greetings.