In what way? I don't see any major differences in the latest build
What is the old MQL5 version?
Do you mean the old MT5 version?
What old MT5 version, in what way?
It won't work as you need a connection to a broker/quotes provider (like a MQ-demo account) and theses servers won't accept old terminal versions!

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I want to use MQL5 old version. i think looks easier
That's good enough in my opinion.