Where do I download the map?

here: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/maps/2430821-unusual-parkour-1-8-parkour

What version?

1.8.

Why are the barriers visible?

To make the speedrun faster paced and less boring. However, if you prefer, there is a separate leaderboard with invisible barriers for each category. The ID for barriers is minecraft:barrier, holding one will make them appear.

What's reverse%?

It's in the rules, and you can download the map in Resources.

(to be continued)