All your progress in the game EG what worlds, minigames, gyms etc you have unlocked is contained in the file save.bin, so long as you have a copy of that file you will be fine. Similarly, any decks you make are just text files saved in your decks folder.
When crazy party gets updated, the new installation will contain the game exe file plus some game data files, but it won't contain a copy of the save.bin file or any new deck files, since these get created as you start playing the game, so to update, just unzip the contents of the new installation directly ontop of your old one, and when your asked to replace the files go ahead, and you'll have the latest version with all your save files.
I would however recommend backing up the save.bin file just in case, indeed you can even copy the save.bin file onto other machines if you want to continue your game in more than one place (I've had mine on three machines so far). Ditto with any decks you create.
Hth.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)