I have core version 5.7.4 but version installed 5.7.2.1. I don't understand what the difference between those two are, but I've come to understand that I need to update first to 5.7.3, then 5.7.4, then I can finally updated to 5.7.5. Where can I find those versions in zip form in order to do manual updates?

Any help is appreciated. I thought using concrete5 was going to be a bit simpler to manage, I'm hoping after these updates things will go a little smoother because I'd love to keep using it.