Update wordpress manually

Step 1: Replace WordPress files

  1. Get the latest WordPress zip (or tar.gz) file.
  2. Unpack the zip file that you downloaded.
  3. Delete the old wp-includes and wp-admin directories on your web host (through your FTP or shell access).
  4. Using FTP or your shell access, upload the new WordPress files to your web host, overwriting old files.

Untuk update plugin masuk ke wp-content/plugins langsung ganti dengan yang baru.

Referensi : http://codex.wordpress.org/Updating_WordPress