You don't need to understand/use Git or GitHub itself. The current master - in this case 1.5.8RC which naturally changes after 1.5.8 is release - can be downloaded directly. Two ways:
On our download page is a direclt link named "Support build (GitHub master)"
On https://github.com/zenphoto/zenphoto you find a green button named "Code" on the right. If you click on it it folds out and at the bottom you find a "Download ZIP" link.
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You don't need to understand/use Git or GitHub itself. The current master - in this case 1.5.8RC which naturally changes after 1.5.8 is release - can be downloaded directly. Two ways: