Error 404 in existing pages

Hello everyone,

I have created a clone of a website locally in my computer(i use wamp server) in order to test some changes. My website has two languages(English and Greek). While I was making the changes I wanted, all the English pages (except the homepage) suddenly stopped displaying in live preview and I got the error: “404. Page not found”. The Greek pages are shown correctly.
I checked the links in the Edit Page section of the dashboard and they are correct.
I also tried:
1)Clearing wordpress cache with plugins
2)Clearing my localhost cache(although I am not sure if this was done properly)
3)Updating permalinks from settings
4)Replacing my .htaccess file with:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
5)Checking if rewrite_module was enabled in wamp server(it was)

None of these worked. Is there anything else I could do?

PS. This is my first post and I am not sure if this is the correct forum for this topic, if it isn’t would you please be kind enough to redirect me?

Thank you in advance!!