I'm new to this site, so pardon me if I do or say something wrong.
I have an old MacBook late 2008 unibody that has Linux installed on it (3 different linuxes, don't ask why). I bought this MacBook second hand a while ago. I wanted to install Linux on my Mac but didn't know what I was doing back then, and accidentally deleted the whole MacOS and everything. Currently, I'm tripple booting my "Linuxes" via "rEFInd". I want to install the latest MacOS available for my model but I don't know how to do it. Where would I find a DMG and how would I install it. Could anyone guide me or help me? I don't have any warranty nor do I have an Apple store where I live.