Connect your phone to your computer,in the "internal storage" look for the folders Alarms,Notifications,Ringtones, that is where you want to place the files you downloaded.
OK,now go to the Download folder and inside there is a folder named Audio compressed(zipped),un-zipp the folder in the same place and inside you will find 4 folders Alarms,Notifications,Ringtones,Ui.
Copy the files from each folder to their respective folder in the "internal storage",Alarms to Alarms and so on.
Good Luck!
I want to mention that you can do almost the same thing with a File Explorer on your phone.