It doesn't give me a custom install option, and i've tried every way possible
like i said earlier, in the same window the installer says not enough disk space, there is a browse button which gives the opportunity to choose installation location, but it jams the computer if click it. So i think i should somehow change the location before installing, but i don't know how, or is it even possible in macbook. My friend has the exactly same laptop, with even less disc space than mine, and there was no problem when i installed the archicad there. And it works fine. I really don't know what's the problem.