The most reliable way to get legitimate software is to buy a of "Microsoft AutoRoute 2013" or "Microsoft Streets & Trips 2013" (the North American equivalent).

Official support and downloads for ended in 2014-2015 , and the product has since been discontinued . Because it is no longer sold or supported by Microsoft, you cannot download it from the official Microsoft Store or Volume Licensing Service Center. Current Status & Availability

The short answer is , but with significant caveats. Since Microsoft no longer sells or supports the software, your only options are: