How can I get no limit demo account?
Each holder of a live account with Dukascopy can request an unlimited demo account. Please contact your account manager regarding this.
If you don't hold a live account with Dukascopy, you can open an extended validity demo account, which is basically unlimited too, as long as you use at least every 14 days - that means you must complete (open and close) at least one trade in that period.
You can open an extended validity demo account from the main community page ("Open now" button): https://www.dukascopy.com/fxcomm/
Register Extended Validity Demo account from the main community page (You need only one trade during 14 days) or become live client and request unlimited demo account.