For technical reasons (code flow structure vs. 'save anywhere approach' of renpy) that is not possible for major version increments.
What you can do:
- Save you gear in the multiverse pod or save your warehouse content and bots with the pod
- Install new game in a fresh folder
- Select new game / starting point / day
- Get your stuff from the multiverse Rift and continue playing
Details are described in the walkthrough chapter MV Pod in the OP.