OK, thanks for your answer .

So, if I understand correctly, the old files that are missing in the new version, should be removed.

If this is true, I have the following suggestions for the update process description (to make it more straight and unequivocal):

• the 'How to update' description could be a bit more specific: what exactly to download, what to unpack, which files should be replaced before starting the update process,
  
• the list of files/folders to be replaced is now described as the list of files/folders to be uploaded. I think that 'replaced' would be a more precise word,
  
• the list of files/folders to be replaced should be unambiguous (e.g. there's no need to list subfolders, if a folder is already listed).

P.S.
I hope you find my suggestions at least a bit useful and not a sheer criticism . This is not my intention at all - I love my little forum! .