How to aggregate multiple reports generated into 1

Sir,

i find a link...
http://relevantcodes.com/extentreports2/extentmerge/docs.html#directory

but, am unable to find [b:ub19xir5]extentmerge.jar[/b:ub19xir5] to use[Its not in extentReports download]

[b:ub19xir5]Where can i get extentmerge.jar sir ?[/b:ub19xir5]

Sir,

link for extentX...http://extentreports.relevantcodes.com/extentx/


here have installed NodeJS, MongoDb..but as in step 3

3>Run Mongo daemon

Open Console
Navigate to MongoDB folder
Run mongo

[b:svadgn2e]I get 'mongo' is not a recognizable command[/b:svadgn2e]

i don't know anything about mangoDB.