Patching

From Gekkeiju Online

Patching of the game happens automatically when the game is launched through the autopatcher (gekkeiju.exe). Patching of the game is important since new features get added weekly.

Sometimes some patches also prevent older versions of the game from logging in.

Patching issues with Windows Vista

Windows Vista doesn't by default give write permissions to Program Files-directory (where the game installs itself by default). This means that the patcher and the game needs to be ran with administrator rights (or those who have more knowledge can customize rights that suit them).