Hello fellow traders,
New around here and have read the manual and tutorial.
My problem is when trying to set up the demo of Zorro and finally pressing Trade button it says:
I have downloaded all of the price data from year 2001 to 2013 and available 2014. Also ran the "Download" script, but still it says "4 bars missing".
Has anyone ran across this issue before?

Thanks in advance.

Yes, your MT4 server has not enough data for the relatively long lookback period of Z12. Thus, Z1, Z2, and Z12 can normally not be traded on this server.

There is a workaround, but it is tricky. You must install the recent 2013 and 2014 price data from the Zorro download page, and set "Preload" in the .ini file. Then Z12 can be traded even on servers with short history.

It worked like a charm.
Thank you jcl, and I appreciate you taking time to answer most basic sandbox questions, it will pay off at the end.

Now I will test zorro's stability and get busy converting my mql codes.
Cheers