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You need to play 0.14 to play 0.18 i think :D 

Hmm. Ok.  That's really not how version numbering works though. And itch.io's installer/manager/updater app can't handle something that strange. It wants to install 0.18, but can be forced to install 0.14, but not both side-by-side.  Dev: This would work much better as a Part 1 and Part 2 as separate applications; or a main game, and a part 2 defined as a DLC for it.  The installer could deal with that if it's set up right.

Yeah not really sure how that works. These games are in different folders so I can't see how one would know about the existence of the other.

First you need to play 0.14. Save at the end. This Save will loaded in 0.18. It's impossible to play only 0.18!