Usually people get WinRAR or 7Zip [Prefers 7zip], and when you've downloaded that--
1- Save the map ZIP file in a good spot. I suggest your Exports folder. That's Start Menu-> Computer-> Local Disk (C:)-> Feral Heart -> Exports
2- After saving, go back to said exports folder and find the ZIP file.
3- When the file is located, RIGHT click said file and you should see WinRAR/7zip on the tab. [May have to click again if it didn't show]
4- Click to "Open Archieve" or "open"
5- You should see the file. Open them until you see all the smaller files. [Number of them varies on said map. Never choose the folder file.]
6- Select all files and copy them over to Exports.
7- Restart your game, and go to the cape. There should be a portal and enjoy your roleplay!
Warning: If there are ANY files that say READ ME, you should probably open that by either right clicking and opening with notepad or something, or double clicking it [Sometimes it will just pull up notepad] The READ MEs usually give you instructions on where to place certain files.
Hope this helps. ^^