• Download highest-resolution images if logged-in (#630, #662)
• Store sessionfile per default in a persistent path, e.g. on Linux and OS X in ~/.config/instaloader rather than in a volatile temporary directory (#659)
• Windows Standalone EXE: Start Powershell instead of CMD if started via file explorer
• Warn if --login is used with an invalid username parameter, e.g. an email address (#624)