Material Maker is on Flathub, the AUR, and on Snapcraft (not up to date, but you shouldn't use snap anyway).
No need for a manual install.
You'll find a lot of software is available via package managers. Linux people don't like installing anything without it being managed by a package manager so the installation and subsequent updates are automatic and occur alongside system updates. So when people find software they like, they'll go out of their way to package and distribute it for others as well
Flathub and the AUR are by far the most comprehensive, and flatpaks works on a lot of distros. So I checked those.
They've also been getting their kinks worked out over the last few years and work much better than they used to.
That review you found is two years old and was for version 1.1. Current version is 1.4. Try it out today, if it's been fixed leave another review letting people know. It seems to work just fine for me.