I have copied below what it says in the GitHub README.md which infers it ought to run on all Raspberry Pi hardware.
This version is the most up-to-date version of rclone-browser the original version has not been updated in years
Situation with Linux is a bit fuzzier…
Linux binary (AppImage) for armhf architecture runs on any Raspberry Pi hardware using Raspbian based on Stretch or Buster.
Linux binaries (AppImage) for x86_64 and i386 architectures should run on systems using distributions released in the last few years. x86_64 one is built on CentOS 7 (released in 2014) and i386 on Ubuntu 16.04 LTS (released in 2016).
The whole idea with AppImage is to build it on the oldest still supported LTS distro – and it should work on all newer OS releases. AppImage contains an aplication and all the files the app needs to run. In other words, each AppImage has no dependencies other than what is included in the base operating system.
In practical terms it means that for example for Ubuntu Rclone Browser AppImage works on all versions starting with 16.04 LTS and for Debian starting with Stretch. With other distributions YMMV but I test major ones like Suse or Fedora. This is Linux. 10000 different distributions… with changes and customizations often only their authors are aware of. I would be happy to hear what distribution it does not work for.
OK but the problem is the original version has not been updated in 8 years and although this kapitainsky version has not been updated in 5 years it does seem to be the newest version so it looks like I might be unlucky.