v2.4 unfortunately contains a critical crash-bug: selecting a launcher in the inventory while having a launcher equipped will in many circumstances crash the game. I have fixed this bug (and another less critical crash bug) in v2.4.1, so please re-download.
You can unzip the archive over your v2.4 folder without losing saves or settings. The saves are fully compatible with v2.4.
Thank you Martin, cheapmiami and player for reporting these bugs!