I just have a question, so whenever the next version of the games comes out all the old saves will be useless? And if true, then all the progress and both money and Lilli's training will be loss? (My bad english not first language)
Usually that won't be the case, and saves are transferable/work with the previous version.
Example - Saves from v0.05 of Terrene, will work with v0.06.
However, the next patch on my patreon, which is v0.07 is a massive update that finishes off act 1/Lily's story and I had enable a few previously disabled features, which breaks all old save files.
So your current saves won't work with the next update, when I release it.
I have added a skip to lily's training option at the start of the game though, to help players get back to where they were before.
If you ever want to know more, I talk about what saves works/don't in the changelogs I post when I release a new version.