I’m going to assume that my EZDRUMMER 2 is compatible with all EZX (Expansion kits).
Requirements state:
A working EZdrummer 1.4 or a Superior Drummer 2.3 (or above) installation. 

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This is confusing. This seems like 1.4 only.
If the requirements would say:
A working EZdrummer 1.4(or above) or a Superior Drummer 2.3(or above) installation. 

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Would make me feel more confident.