How does the BIJAN 4 seasons work?

I bought two of the packs. The summer and the fall pack. How do these work? Do you install one pack until the season changes then uninstall and install the pack for the next season? What if you have more than one installed at the same time? I had the summer and I also installed the fall and loaded up the game. The summer pack seemed to override the fall pack, but there were no conflicts like crashes or frozen screens. I assume they don’t automatically know the time of year do they?

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