I've been trying to install macOS Mojave on this thing for a few hours now but I've come across a few problems. If I try to update it through the appstore software updates it gives me error (102), you obviously can't find older versions of macOS on the appstore anymore so that didn't work either. A few people recommended me to open the page through safari but I can't open the installer from safari into the store. I don't know how exactly to explain what I mean so I'll attach an image. No download button, can't open it in the store.
(If you haven't realized I'm currently running on 10.8.5), help would be much appreciated! I need this thing for school since my other laptop quite literally gave up.