How to update data

Hi,

I have downloaded Metatrader4 two months ago.
All the time frame are not updated.
When I trie to download the data from the "History center" I don't get any data.
The serveur are "MIG DEMO" or "ODL-MT4 DEMO".
How is it possible to update the charts?
Thank you!

pls, CAN ANYBODY TELL ME THE BEST MT4 BROKER THAT IS RELIABLE FOR TRADING. I AM CURRENTLY USING NORTHFINANCE AS MY BROKER.THANKS.