Occasionally, patching issues can occur when certain game files become corrupt. Using the "Verify integrity of game cache..." function in Steam will fix any corrupted files.
1. Launch Steam client.
2. From the Library section, right-click on Thronebreaker: The Witcher Tales and select Properties from the menu.
3. Select the "Local files" tab and click the "Verify integrity of game cache..." button.
4. Steam will verify the game's files - this process may take several minutes.