No one in their right mind installs "codec pack" anymore.
Use modern media player like https://mpv.io/ (https://sourceforge.net/projects/mpv-player-windows/files) and you won't need any kind of codec pack. Codec pack will only mess up everything on your computer.
Make sure you have the latest GPU drivers installed and a good media player and everything should just work.
I was trying to solve a specific problem with video thumbnails not working on certain formats, it didn't help and i already uninstalled it but i thought it would be prudent to include this.
Customer support service by UserEcho