You can check whether your MetaTrader is the latest version by clicking the “Help” menu and selecting “About”.
You will see a popup window and it will show you the version and build of your MetaTrader.
MT4
MT5
To know what is the latest MetaTrader version, please go to Metatrader's official website.
Please also refer to this page: Would it be possible to send a notice email ahead of making specific MT4 version out of date?
If you require further assistance from our support team, please contact us during our working hours as stated inside: How do I contact Valutrades Customer Support?