Dune - Extended(1984)h265.mp4 Here

It is roughly 177 minutes long and adds nearly 40 minutes of footage. It features a new 10-minute prologue narrated by a male voice over still paintings, replacing Princess Irulan's original intro.

Most viewers consider this an interesting curiosity but a "painful experience" that over-explains the plot. Dune - Extended(1984)H265.mp4

The "Spicediver" Fan Edit (Dune: The Alternative Edition Redux) It is roughly 177 minutes long and adds

This version was prepared for television in 1988 without Lynch’s involvement, leading him to remove his name from the credits. Dune - Extended(1984)H265.mp4