MT4 old version error represents an error that shows that the trader has an old version of the MetaTrader platform installed on a PC or phone application. This version is not compatible with MT4 servers anymore. In this case, the trader needs to update the current version of MT4 or MT5 software. There are two solutions. The first one is to download and install the new version from the broker’s website and the second solution is to run an automatic update of the MT4 platform.
Go to the desktop icon of your MetaTrader platform. Right-click and choose “Run as Administrator.” Usually, the Metatrader software will be updated to the newest version. Check is there any MT4 Common error or off quotes in MT4 error.
However, sometimes, very rare, the only solution is to install the new version in the new folder and to remove the old version from the computer.