Hello,
If you have never updated the firmware of the Evo, I am afraid you will have to send it to the Multiplex repair service in your country, they can update it to a version which will accept a M-Link module (2.xx or higher). After that you can do further updates yourself using the Multiplex Launcher software, but you will need the special cable that Multiplex sells to connect your transmitter to your PC. Updating is usually not strictly necessary.
The conversion is not difficult, did you get a manual with your M-Link module? It involves changing the 35 MHz module for the M-Link module, and removing the antenna and replace it with the 2.4 gHz antenna which is pushed through the same tube that your 35 MHz antenna came out of.
Max.