Template:ReplaceFiles

Here is how to update files:

  1. Click on the file number
  2. Follow the link to "upload a new version of this file"
  3. Upload the new file - you can name the new one any way you like (keep it the same or change to something new - it makes no difference)
  4. When you see the little [B] next to the file description, you will know your replacement was successful

It might appear to be the old version if you view it for a couple of days when logged out, because the site's cache hasn't been updated, but the new one is what will actually download.