You should be able to use MixEmergency version 2.1 - which will work with almost all versions of Scratch Live and works with MixEmergency 1 authorisation codes. However, if you're running Serato DJ or looking to upgrade your operating system, I strongly suggest that you upgrade to a MixEmergency 2 authorisation code so that you can benefit from all the new features and, more importantly, fixes that have been added since MixEmergency 2.1 was released (it's almost 3 years old).
