Changes apply to site, but page shows 404 error, even though it exists

GitHub - RainmanXdefinite/RainmanXdefinite.github.io: my site - I want to link to /arts/text-to-html-web/v0.1b/index.html and /arts/text-to-html-web/v0.2b/index.html (which both exist in the repository), but it shows a 404 error

It looks like you’re linking to the following URLs:

https://rainmanxdefinite.github.io/arts/text-to-html-web/v0.1b/index.html
https://rainmanxdefinite.github.io/arts/text-to-html/v0.2b/index.html

However the correct links should be:

https://rainmanxdefinite.github.io/arts/text-to-html-web/0.1b/index.html
https://rainmanxdefinite.github.io/arts/text-to-html-web/0.2b/index.html