I have already put the files so the routing works correctly, I have already uploaded the database and changed the MySQL configuration in the constants file. Everything is fine on the homepage, but some pages on the admincp don't work such as payment, coupons, labels, and theme. Can you share the .htaccess that you used on /admin. I have tried changing the .htacess but the same problem keeps happening. I have got it checked by another person and they say that there's missing files.
I really hope everything gets sorted out. For everyone else I will let you know with further updates if these issues get sorted.