In some cases, overzealous antivirus software (like Windows Defender) flags the d3dx9_43.dll as a "false positive" and moves it to quarantine—especially if you are using game patches or mods (like Smoke Patch or PTE Patch).
You might see websites offering a direct download for the d3dx9_43.dll file with instructions to place it in the System32 folder or the game folder. how to fix d3dx943dll missing pes 2017 work
Microsoft provides a web installer that fetches all legacy DirectX 9, 10, and 11 files, including d3dx9_43.dll . In some cases, overzealous antivirus software (like Windows
Leo replied instantly. "Don't download the DLL individually from those DLL download sites. That’s a trap. You need the source." In some cases