The “Keep me logged in” feature was designed to give you access (for 3 months) to Cisco Packet Tracer 8.0.1 or higher without needing to re-enter your credentials each time.  Using the “Keep me logged in” feature is only recommended for private computers. If you are using a public or shared computer, you should NOT use the “Keep me logged in” option or you should ensure that you Logout before closing Cisco Packet Tracer to prevent other users of the computer gaining access using your credentials.