- Verify if the date, time and time zone on your PC are correct.
- Visit the Isabel 6 download zone to check if you have necessary components to work with Isabel 6.
- Try again.
- Verify that all Mac software updates have been installed.
- Make sure you are using a supported browser (Safari, Chrome or Firefox) and that the browser is up-to-date.
- Try again in one of the other supported browsers.