Once you downloaded the file, open your downloads and right click on the file and hit extract all. Then, type "%appdata%" into your windows search bar. From there, click on the folder ".minecraft" Then click on "saves". Drag the extracted file into saves. Reload your Minecraft and you should have the end practice.

@ytsirjoshie have you tried ninjasnail's timer? It's really simple

I mean I don't practice one cycles consistently, rather just do runs, but I can 6 bed consistently about a month after I started trying to one cycle.

Use 1.16.1 and use piglins, for trios as well. If you wanna trade with villagers, do 1.14.4.