DirectX 7.0 (released in 1999) is with Windows 10 and will not help your joystick. In fact, trying to install it can break modern DirectX 12/11 functionality.
If you cannot get your joystick working in a DirectX 7 game on Windows 10, consider these proven alternatives: Download Directx 7.0 For Joystick Windows 10
Therefore, the method of installation matters just as much as the download itself. DirectX 7