You can find more info in the purchase page The EX versions adds the following features: if someone will be using n-Track on your laptop while you're using it on your desktop). You'll need to purchase an extra license only if you'll need to actually use the program on the two computers simultaneously (i.e.

You can install and register (using the registration codes you received when you purchased the program) the program on two computers provided that you don't actually use the program on both computers at the same time. Can I install the program on both my desktop and my laptop or do I have to purchase an extra license?.Yes, starting with n-Track Studio version 4.0 the ParEQ and Compressor are included with n-Track.

Are the ParEQ and Compressor plug-ins included in the n-Track registration?.