If you are encountering this problem then the odds is that the build of your MetaTrader 4 (MT4) is not the latest one. Theoretically if you restart MT4 it should prompt you to upgrade to the latest build. If it doesn’t then you are most probably encountering one of the following cases.

A. Your demo account has expired.

You need to open a new demo account. If you do not know how to open a demo account click here . 

B. You are running MT4 in Windows Vista.

You need to disable “User Account Control” from “Windows Security Center” and then restart Windows. When you start MT4 it will hopefully prompt you for the upgrade.

If none of these solve the problem consult your broker. This is an MT4 issue and they sould be able to address it.