Click "Upgrade".
If you run into an issue with an error saying "Search Protocol Host ID" or something similar then perform the following.
Click Start ->
Type "cmd" ->
Right-click on "Command Prompt" and select "Run as Administrator"
At the command prompt window copy and paste this command.
taskkill /f /im SearchProtocolHost.exe
Now click "Retry" and continue selecting the default options.
Click Finish.
Launch Outlook