How to install an EA on the new updated MT4 - and how to make it run?

hello community

I have never installed an EA - and never had a Demo Run with an EA

now I got interested in the Turtle Trader EA

Turtle Trader - MQL4 Code Base

I think, this Strategy could work out fine and I would like to install and run it on a Demo

can anyone give me some Advice, how to install the EA on the new updated MT4 ?

cheers

File ,
Open data folder,
Copy files to correct folder,
Restart mt4

sorry - what is the correcct folder?
how to initiate the EA?

lets wait - maybe somebody else can give me a better orientation