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Updating Older Maps

Have a map on an earlier version which you would like to update to the newest version?

How can I upgrade a map to a newer version?

The best way is to use a server, instead of the client. Download the official server.jar from Mojang and start the server with this line:
For Windows:
Copy the below line into a text editor and save the file as "start.bat". Place it in the same folder as the server.jar and execute the *.bat file)
java -Xmx10240M -Xms10240M -jar server.jar nogui --forceUpgrade --eraseCache