Luriel should clarify this, I presume. I am not fully sure, it seems that there are three different passwords : one for season 1 ; and one for each of the two chapters of season 2. But the files containing the passwords have the same name. It may happen that the file containing the password is replaced when you download another season or chapter. I have made a copy of them outside of the game so I always have them ready. The password for season 1 is a 4 characters one. The others are longer. I hope you may find it if you download again only the password file, when scrolling down all the available files for season 1. Be sure to keep the one you already have, somewhere safe ! It is definitely something which can be improved and clarified for players, even if not major.