You are allowed to install MixEmergency on two computers that you personally own (e.g. often you'll want it on your backup computer). However, at any given time only one copy of the software may be in use (the only exception to this is that you are allowed to run it at the same time on two different computers that you personally own when using the NDI Input and NDI Output feature to stream video between them).
If you wish to install it on any further computers then you will need to purchase further licenses.
No. MixEmergency is officially compatible with Scratch Live, Serato DJ, and Serato DJ Pro only.
Your authorization code will be emailed to you once your payment has been processed by FastSpring. If ordering via Credit Card or PayPal, then you should receive your authorisation code immediately.
When you purchase MixEmergency you will get minor updates and bug fixes for free. Minor updates are updates in which the first version number has not changed (for example, version 1.0 and version 1.1). Major updates (for example, version 1.9 to 2.0) may incur an upgrade charge.
No. Not in the near future.