Welcome to the forum.
You’ll do better if you start your own thread rather than hijacking someone elses theread.
Also please remember that while we work to support each other, its community lead support, so we help when we can. If you’ve not had a reply, then it just means noone has been available who knows how to help.
a 404 page not found error occours when you are trying to access a page that doens’t have an associated file.
so this link that I shared above might help:
Honestly though, a 404 error is likely something only you can fix. Make sure that your “index.php” file has no capitals. Things like that. And check your .htaccess rules if you’ve changed any of them