Custom indicator not visible in Navigator window

 
I have MT4 Build 840 (Jun 12 2015). I found 2 indicator files on forex factory forum - GMMA Fast.ex4 4KB and GMMA Slow.ex4 4KB. I copied them to FXDD-MetaTrader/experts/indicator folder. I cannot find them in the Navigator window to install them. I have used the same procedures for other indicators and did not have this issue. I have attached one of the files if you need it to assist in resolving this issue. I wanted to attach both files but not too sure how to attach both of them at the same time.   
Files:
gmmawfast.ex4  4 kb
 

It's has been changed 1.5 year ago.

Data Structure in MetaTrader 4 Build 600 and Higher