1 - Download and install 7-zip
2 - Download the latest TWRP .img
3 - Open a file explorer, rename the downloaded file to: recovery.img
4 - Right click on the file > 7-zip > Add to archive...
5 - In this screen you can change the file name and, most important, in "Archive format" choose "tar"
6 - Open ODIN and flash the new file as always
Note: maybe other .img files (I mean other than the TWRP recovery) works too.
This is how the final file should look:
// Other stuff
[MOD] Centered clock in status bar [6.0.1][.ZIP][SM-N910C]
You can try this too to convert the .img to a "tar.md5": http://forum.xda-developers.com/show....php?t=2446269