Write access is needed in the program directory for automated updates. Please install in the default location or a writable directory of your choice. The automatic update functionality will be unavailable if installed in a write protected directory like C:\Program Files\.
Tip: The latest beta version fixes various OSX related compatibility issues, please give it a try in case you experience any problems on OSX.
Only download the beta version if you are comfortable with testing beta features. This version may introduce stability issues and other bugs. Once the new features are sufficiently tested, they will be integrated to the stable version.