There are a few options you can use to play the ISO files downloaded from us.

Both Kodi and VLC have DVD/BD menu playback; Kodi is generally more accurate from my testing, but both work fine.

If you need even more accurate menu playback (with support for things such as numpad-based easter eggs), I’d recommend CyberLink PowerDVD. It’s paid, but you can easily find cracks for it online.

Alternatively, you can attempt burning the ISO onto an actual physical disc and play it on a dedicated DVD/Blu-ray player.

If you just want to watch the movie and/or extras in high quality without the menus, you can use a program like MakeMKV to rip the videos out of the ISO.