Once a dialog box appears, click Save File. The downloaded file should open automatically. If it doesn't, manually open it from your browser's download window.
Click OK to confirm that you're aware this is an executable file.
Read through the Google Calendar Sync Terms of Service, and click I Agree.
Follow through the Installation Options and click Install to finish the set-up process.
Once Google Calendar Sync is installed on your computer, the Google Calendar Sync Settings window will appear: