Can't you transfer your saves instead? In the game's "game" folder, you'll find a "saves" folder. You can copy it and place it into your other computer's "game" folder to keep playing with your saves.
The mod does have a secret feature, where you can start playing from any chapter, but I usually discourage using it, that's why I keep it mostly secret. Starting from any chapter feels like loading someone else's save; it's less personal than when you got there yourself. I usually recommend just playing Eternum again from the start, the game is entertaining enough, that you can play it many times!
But if you really want the secret sauce: You can click/tap on the N of eterNum on the title screen five times to bring up chapter selection.
And I'm glad you like my mod! <3