'Final Fantasy VII: Advent Children' will be re-released in 4K HDR on June 8th - Engadget
A 2009 version called Final Fantasy VII: Advent Children Complete also included an extra 26 minutes of footage.
Even if the plot might be confusing, it should look better than ever in 4K and HDR10.
If your only other experience with Final Fantasy VII is through FF7 Remake, the movie might make even less sense.