there can be 2 problems that i know of
i will discuss the one that i know how to fix first (its a bit confusing so read it carefully)
problem 1: you hae put the map in your minecraft saves folder and it will not show up on your map list, this is an easy fix
step 1: go in your minecraft saves folder
step 2: go into your downloads and find the ZIP file that the map is in
step 3: open the ZIP file (right click, open) if it says you cant open then right click, open with WINrar, IZarc or whatever archiver you have
step 4: once you have the zip file opened, double click on the folder and find the level.dat (there maybe files called old level.dat but just highlight all of the files that look like a peice of paper)
step 5: once you hilighted all of the files that look like a peice of paper, shrink the window that the minecraft saves folder is in (you know the button next to the X in the top right of the window) also shrink the ZIP file of the map then double click on the name of the map folder in the minecraft saves window
step 6: in the minecraft map folder, right click AND HOLD any of the hilighted files and frag them into the with space in the minecraft map folder (MAKE SURE you do not drag them into any of the files that looks like a folder)
problem 2: you downloaded and installed the map correctly but for some reason your not in the map your supposed to be in
problem 3: (in know theres only 2 but TOO BAD!) you only downloaded it and left it like that
step 1: go to your startup menu (if you have windows click the little color thing in the bottom left of the screen)
step 2: in the search bar type in "%appdata%" (without the "'s IMPORTANT: type in the percent signs to)
step 3: press the ENTER key
step 4: double click the .minecraft folder
step 5: double click the saves folder
step 6: go to your downloads and find the map's ZIP file
step 7: open the ZIP file
step 8: in the ZIP file of the map, right click and hold then drag the folder IN THE WHITE SPACE in the saves folder
(if you don't see the world in your minecraft maps while in the game then read "problem 1" at the top of this answer)
PLEASE READ THIS CUZ IT TOOK A LONG TIME TO TYPE!!!!!
it wont you need to download the server thing of the minecraft website and replace the old one with it.
only minecraft classic multiplayer is free, beta mp is for premium only a.k.a buy the game.
probably not,unless u have friends that know ur server but strangers probably wont join ur game
either you don't have An internet connection or you have a cracked account on minecraft and it wont let you on. The alternative to this is their minecraft server was having issues.
its not out for 1.8 and it wont be worth it cuz 1.9 is out
They may be outdated, not only the map version but maybe some of the redstone used.
Re instull Minecraft
You Wait For a While and Change Maps Like If Your Doing Terrarium Quests and You Finished But Wont Turn In Change To a Different Place then Come Back. If It Wont Work You Must Refresh Page and Restart Quest.
well minecraft 1.3 comes out some time today and 1.4 probably wont come out for several months and to update you just log in to the launcher and download the update.
They don't.
you wont believe what it is its 12345
it might be your visa card try email visa and/or minecraft for suport.
tell mojang about the problem or wait
it wont you need to download the server thing of the minecraft website and replace the old one with it.
only minecraft classic multiplayer is free, beta mp is for premium only a.k.a buy the game.
unfortunately there wont be a wii on the minecraft, 4j studios (the proudcers of minecraft xbox) made it on the xbox. They will only make it on there because there tempting you to get an xbox with live. But they will make it on the 720.
probably not,unless u have friends that know ur server but strangers probably wont join ur game