Another option, owing to how computer savvy you both are:
Note in Sentinel where your Sentinel folder is located. Then using Windows Explorer navigate to that folder and copy ALL the files in that folder to an SD card, Dropbox or any other media you can share with your friend.
Once your friend has installed Sentinel in his machine, have him note the location of the Sentinel folder. Then using Windows Explorer, have him copy those source files you have provided to that Sentinel folder destination on his machine.
That will more or less give him a mirror image of your Sentinel files and he can work with them as desired.