Most difficult part for you might be to install Java, and set up the JAVA_HOME environment variable.
What OS are you currently on? Windows 7 or Windows 10 (any other Windows I can't make screenshots on, as I've always refused to use Win8/8.1)
Oh, btw, it works like a charm, just tested it with a couple of Office 2013 documents, and found any word I threw at it
C:\Users\Ath\Documents>..\Downloads\Contro\crgrep-1.0.5\bin\crgrep -i word *.docx
The -i is for case-insensitive search