Before you open that shortened link, you must understand the modern threat landscape. Clicking random Bitly links promising free software is one of the fastest ways to compromise your machine.

While popular as a "cost-effective" alternative, this method carries significant risks: End of support for Office 2013 - Microsoft Support

In Windows File Explorer, go to "View" -> "Options" -> "View" tab -> Uncheck "Hide extensions for known file types." If you download Office2013 Key.txt and it actually shows Office2013 Key.txt.exe , delete it immediately.