Using tools like CreamAPI or modified APKs violates the Terms of Service for Steam and Google Play. While bans for Talisman specifically are rare, a "VAC ban" or account suspension can result in losing access to your entire game library.
Talisman is a highly sensitive multiplayer game. If your game files don't match the official version, you will likely face frequent crashes or "Desync" errors when trying to play with friends or in public lobbies. The "Shared DLC" Feature: A Legal Alternative talisman digital edition dlc unlocker
If you want to own the DLC for yourself, you don't have to pay full price. Using tools like CreamAPI or modified APKs violates