It could have something to do with that, because only 64-bit of EZdrummer 1 should not be possible to install... First you install the full product installer version 1.4.0 (a 547 MB download), which gives you only 32-bit. It should write an SDIVersion in the registry. Then you can install 64-bit from the 1.4.0 update (a 40 MB download). And don't uninstall the 32-bit after that.
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