How to install DirectX 9

DirectX Install
Istaria uses DirectX 9. While newer versions of Windows have built in compatibility for DirectX 9, Istaria requires a real install (instead of compatibility). Please visit Microsoft and download the June 2010 version of DirectX 9
https://www.microsoft.com/en-us/download/details.aspx?id=8109

Alternatively, you can download directly from the patch server.
https://s3-us-west-2.amazonaws.com/istaria-install/directx_Jun2010_redist.exe 
 
DirectX Bypass
If you're having issues installing DX9 you can bypass the requirement by logging into the launcher, clicking the Troubleshoot button located at the bottom of the launcher and then unchecking "Use DX9 Shaders"

If you don't know your login or password, please send an email to [email protected],
along with possible email, login name or character names.

Helpdesk FAQ