How do I open my MusicTime download?

I just ordered, paid for and downloaded MusicTime 4.O, but when I click on the icon and try to open it, I get a message: m402m_full can't be opened because it is from an unidentified developer. Only apps from Mac App Store and identified developers, etc., etc. I have a new Mac (less than a year old). Does this happen with every iMac? What do I do now? Thanks.

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