I'm using the SC Sim1 account to test the plugin. I'm not subscribed to SC's real-time data, I use Interactive Brokers for RT data. For this test, I was just trying to pull historical data and run the script.

Also, in the user field, I tried leaving it blank (to which I receive an ES history unavailable message). So I run the script with only zlib in the user field and it appears to pull ES data from 2018-04-02 (based on the Warning message: Warning 047: ES first bar at 2018-04-02).

Based on the above warning, I thought a first step would be to use the plugin to successfully pull historical data. So I created the following Asset file: Assets-SC-ES.csv (spacing appears messed up below, but it lines up properly in Excel):

Code:
Name	Price	Spread	RollLong	RollShort	PIP	PIPCost	MarginCost	Leverage	LotAmount	Commission	Symbol
ES	2700	0.25	0	0	0.25	12.5	6000	0	1	5	ESZ18


I then took the Gap study and modified it slightly:

Code:
// Display gaps in historical data.
// Red lines = gap length in days. 

#define ASSET_LIST "History\Assets-SC-ES.csv"

function run()
{
	StartDate = 2017;
	//StartDate = 2018;
	LookBack = 0;
	set(PLOTNOW);
	assetList(ASSET_LIST);
	//asset("EUR/USD");
	var m = minutesAgo(1);
	plot("Gap",m/(60*24),NEW,RED);
}


Findings:
1. With a StartDate = 2018 the script runs without any errors, but the chart starts on April 2, 2018 rather than January.

2. With a StartDate = 2017 I receive the following message:
GapFinder_2018 compliling..........
Error 055: ES History missing (2017 8192 HistoryES.t6)
Test: GapFinder_2018 ES 2017..2018
Asset HistoryAssets-SC-ES.csv