I made an old CodeIgniter 2 PHP 5.6 website over 10 years ago, and am trying to restore it online; keep getting 404 errors (the first page works, tho)

My page keeps getting 404 errors past the root page, which works: https://www.interjo.in/

I’m running CodeIgniter 2 on PHP 5.6. The pages should not be 404… It should resolve since the time I backed up my website years ago the website was working just fine.

What’s happening? How can I fix it?

I expected the links to resolve to their respective Controllers in the CodeIgniter app but it just keeps saying 404 NOT FOUND (like, for example, if you click on "Login" or "Sign Up"): https://www.interjo.in/

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