Currently(May, 2017) the trading server name available for XM MetaTrader5 is:

XMUK-MT5

The trading server is available for both Demo and Live Trading accounts.

In case you don’t see the trading server in the list on MT5, you may search for it by typing it in “add new broker like….”.

You may just type “XM” in there and you will get all relevant trading servers listed up.

In case you are using a MT5 from different brokers, the server name may not appear even if you search for it. In this case, please download XM MT5 from XM Official Website.

XM Official Website