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cpsogoj, I can reply to your q 2 - get both files, install the bigger one, then the smaller one to get the latest 2.4.
1) On ufoai homepage we see monthly updates, are these updates just for 2.3 version; 2.4?; both? Wich one is more complete and why do you still make changes on 2.3 if you are working on 2.4?