Firstly, I am not a Isso developer and not in any way part of the isso team (if there is any). I am just a simple user.
And as such I did try to install isso a few times over the last few years - and I failed reguarly. So I believe it’s fair to say isso is not the very easiest comment system to install.
At every try I relied heavily on websites that explained how to install isso (and still…). But at my last try I managed to work it out with Docker.
This experience is reflected on this site - so I hope it helps some people to make the isso comment system run.