I didn't manage to install the game, but I think it's because I have a mac, maybe. Basically when I try to install agnostos there's a popup from itch io telling me "cannot read property 'build' of undefined", and I saw that clicking install, in the install section there's nothing written (I should choose a file to install but it's empty, idk). Sad but nevermind, the graphics seem really amazing, good work :D Anyways, can someone tell me why does this happen? Just in case it happens again with other games. Thanks.
If I'm not mistaken, different operating systems run slightly differently from one another. The game seems to be built for Windows, meaning that a Mac OS would not be able to run it. A way to bypass this would be to use a virtual machine. (I don't really know anything about virtual machines, but that link explains a bit about them. Use at your own discretion, I don't know how safe they are.)
I don't know about the itch pop-up stuff, might be related to the OS stuff, but I hope this helps you a little bit :)