How to make a minecraft project download appear in your world?

Downloading:
1. Find your map and download the world save.
2. Drag it onto your desktop.
3. If it is a.zip file, right click it and hit 'Extract All.'
4. Delete the zipped file and keep the new, duplicate file you just created.

Installing the Map
1. Open your Minecraft launcher
2. In the lower left corner, click 'Edit Profile'
3. In the lower right corner, click 'Open Game Dir'
4. When the file opens, scroll down until you find the 'saves' folder. This will be different depending on how many mods or projects you have downloaded in the past.
5. Simply drag your map download into the folder. Make sure not to accidentally drag it into one of the files you already have in there.
6. Exit out of the file and launch your game, it should now be in your worlds.