Early Haiku image installers worked with 128 MB memory. I have an old machine (128 MB) that works real well with Haiku, but not with Linux, etc, due to the memory. Haiku is usable, Debian pretty much not. But, I have never been able to install anything later than Haiku 3 on it. So, I run it with version 3 LOL.
So, I can verify your findings. I guess I could do a manual install without using the installer