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I'm looking at the files from my purchase, can I ask what the difference is between the ExNovo_1-3 file and the EXNovo_1-2_spreads file? They look really similar, at a glance. 

I'm unsure how to answer this. The devlog above lays out the major changes between  1-3 and 1-2. Apart from that, the _spreads file always has two pages next to each other, which is frequently more comfortable to read on a landscape-sized screen (Laptop, tablet etc.)