To experience new version of Mumbai navigator, you have to delete cache from your system.
To do so, follow the guidelines given below.
Deleting Cache from browser:
For Internet explorer:
1. Go to Tools tab
2. Click on Internet Options
3. In Temporary Internet files section, click on Delete Files
4. Press OK.
For Firefox:
1. Go to Tools->Options (In some cases it is Edit->preferences)
2. In privacy Tab, click on Clear cache
3. Press OK.