404 Error for File s2member-o.php

I found other posts on this issue but none of them fixed my problem. Basically the Pro Forms needs this run and on my installation it cannot load and shows a 404 error. The file exists in the correct location and permissions are 644 for the file and 755 for the folders which according to other posts seems to be fine. I have replaced the file and also reinstalled the whole S2 framework and Pro upgrade.
Nothing has changed still get the 404 error

Check if file have need “owner”, that allows the WEB server to read it. If not - ask hosting to fix it, that is on server’s level. Alternatively, set permission “0777” for any file and folder, again hosting can do, but this is dangerous…

@djellis73 See Mod Security (Odd 403, 503, 500 Errors). There’s probably something on the server-side that is blocking access to that file (e.g., ModSecurity).

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