Have you tried to clear your game cache?
Use the "Clear Cache" button in the Options menu on the game title screen.
For STEAM AQ3D:
When there has been a new update, you may need to restart Steam and reload the game in order to see the new updates.
If your game crashed please include a link to the crash log.
You can find this file by going to the folder where Steam is installed and navigating to: Steam\steamapps\common\AdventureQuest3D\AQ3D_Data and finding the file called "output_log.txt"