If you have recently downloaded the installation for Trading Central, you may wish to right click in the white space of the Navigator area and click “Refresh” or alternatively close and reopen the Metatrader platform.
The installer will create the folder and install the files under Indicators automatically. However, if you installed them by putting the files into “Data Folder”, ensure the files are visible in the correct folder.
To do this, go to File (up the top menu of the platform), click “Open Data Folder” and follow the file path: MQL4 (or MQL5), Indicators, they should be in the indicators folder or you may have another folder inside indicators called “Trading Central”, go into that folder to check also. If you still can’t see the indicator files, they may not have gone into the folder correctly and you will need to retry copying them across.