@Ajit_Londhe I’m having similar troubles to @mgurley. Since he’s having trouble I feel less embarassed about admitting mine. 
Maybe it’s a default download option I need to change? Others seeing the same error message for other packages have concluded as much but I haven’t had luck with that yet. Here’s what I get:
devtools::install_github(“OHDSI/DataQualityDashboard”)
Downloading GitHub repo OHDSI/DataQualityDashboard@master
/Rtools/bin/tar: Child returned status 127
/Rtools/bin/tar: Error is not recoverable: exiting now
External tar failed with--force-local, trying without
/Rtools/bin/tar: Child returned status 127
/Rtools/bin/tar: Error is not recoverable: exiting now
External tar failed with--force-local, trying without
Error: Failed to install ‘DataQualityDashboard’ from GitHub:
Does not appear to be an R package (no DESCRIPTION)
In addition: Warning messages:
1: In utils::untar(tarfile, …) :
‘tar.exe -zxf “C:\Users\AWILLI~1\AppData\Local\Temp\RtmpEdU9k7\file44e816a67f0e.tar.gz” -C “C:/Users/AWILLI~1/AppData/Local/Temp/RtmpEdU9k7/remotes44e8467e7433”’ returned error code 2
2: In system(cmd, intern = TRUE) :