cannot find file for everquest plz helpFollow

so i heard everquest was doing a 10 day trial for old accounts and i have been wanting to get back into it. so i downloaded the game and clicked on play but it says it cannont find d3dx9_30.dll try reinstalling the program. So i uninstalled eq and reinstalled it but it comes up with the same message again. i tried googling the file but i realized i don't know which sites are legit and which ones r gonna infect my computer. can someone please help?