Most creators (like the team behind Melissa's Adventures) post their latest bug fixes and version updates directly to their supporters first.
Check the official game page for a "Devlog" post regarding Version 5. Installation Tip melissas adventures ch1 v5 by cosmok fix
Allowing players to carry their progress from V4 into V5 without crashing the game. How to Safely Find the Article or Update Most creators (like the team behind Melissa's Adventures)