Please make sure you've downloaded the interlude final game client exactly from our portal (http://l2e-global.com/reg), and that you haven't installed any third-party software.
- install our launcher
- delete "System" folder from your game client
- disable your antivirus and/or brandmauer/firewall
- make a full check by using launcher “L2E-Global launcher.exe”
- lunch the exe. game file via administrator