Discuss Channel Pattern Detector indicator in this thread. The indicator is able to find and highlight the channel patterns on the chart. It is freely available for MT4 and MT5. You can ask any questions about this indicator here.
What is a "can't open" message? Could you please provide more details on the problem you encounter with this indicator? Attaching a screenshot and letting us know your trading platform's version would help.
Did you copy iChartPatternDetector.mqh file to the same folder as ChartPatternDetector.mq4? Both should be in /MQL4/Indicators/ of your platform's data folder.
There is no archive with both MQL4 & MQL5 files in it. There are two downloads - one for MT4, one for MT5. Both contain the .mqh file + either .mq4 or .mq5.
View attachment 7379