wp-admin inaccessible due to development file paths

I had a website that needed a redesign, so I installed wp in a “dev” folder and created the site in there. My boss then decided to transfer hosting servers, which I thought would be a great time to switch to the new design. The problem is, that all of the file paths are preceded with https://www.website.com/dev” which is an obvious issue, but the bigger problem is this. I cannot get into the wp-admin panel. When I attempt to navigate to https://www.website.com/wp-admin I get a 404 error page, and the url that it takes me to is: https://www.website.com//dev/wp-login.php?redirect_to=http%3A%2F%2Fwww.website.com%2Fwp-admin%2F&reauth=1 and I don’t see an .htaccess file in the wp-admin folder that I can change the redirection in.

So how do I manually go in the files and change the default path for at least some of this stuff to get me started in recovering the website. I changed the paths in the .htaccess file already. Also, I apologize in advance, I don’t know how to tell which version of WP I’m using without the admin panel.