OKAY, LET'S SAY I DOWNLOAD IT. THEN A WINDOW APPEARS ASKING ME WHERE TO SAVE IT, AND HOW DO I EXTRACT IT?
Added 5 minutes later
I DON'T UNDERSTAND. LET'S SAY I DOWNLOADED A COMPRESSED MAP TO MY DESKTOP. WHAT DO I DO WITH IT NEXT? HOW DO I EXTRACT IT AND HOW DO I PUT IT IN THE GAME SO THAT I CAN FINALLY PLAY IT, AND NOT JUST SEE IT AS A PICTURE ON THE WEBSITE?
Next, you launch any archiver that supports the required format (WinRAR, 7-Zip, Total Commander, etc.), extract the map from the downloaded archive, and place it in the Maps folder.