A peculiar engineering decision turned the June 2010 runtime into an anomaly. Microsoft’s DirectX setup engine was designed to check system versions and skip already-installed components. However, the June 2010 installer contained a non-standard version of the update flag. Even on Windows 8, 8.1, and early Windows 10 builds, the installer would "reinstall" a specific set of legacy DX9 debug symbols that no OS update ever overwrote.
Download the official redistributable from Microsoft, keep it on a backup drive, and install it on every fresh Windows build. It saves hours of troubleshooting. directx end user runtimes june 2010 verified download