Even if the installer doesn't ask for it, a quick restart ensures the new DLLs are correctly indexed by the system.
Understanding the DirectX End-User Runtimes Web Installer Repack directx end user runtimes web installer repack
The official Microsoft DirectX End-User Runtime is a package that updates your current version of DirectX—the core Windows technology that drives high-speed multimedia and games on your PC. Specifically, this installer provides the legacy 9.0c and 10.0 libraries that modern Windows versions often leave out by default. Why use a "Repack"? Even if the installer doesn't ask for it,
Right-click the .exe and select "Run as Administrator" to ensure it has the permissions to write to the System32 and SysWOW64 folders. directx end user runtimes web installer repack