I had that problem before. I did the download with v5 still on my computer and when I would log on the log in screen (where you choose your server) would be version 5 but there was a little square with the v6 logo and a little bit of a different background showing. I tried to unistall wlo but there was some file missing so I just deleted the entire file. After everything was deleted I downloaded v6 and it created a new folder and all new files and now the screen loads showing v6. So try deleteing the entire folder then downloading v6.