You can just inject demos in to a USB flash drive as shown in this tutorial here: https://digiex.net/guides-reviews/c...xbox-360-how-inject-into-usb-flash-drive.html You could then copy the demos to the slims hard drive if you wanted to.
I was going to say in my last post but forgot, this most up to date version of the program can be found here: https://digiex.net/downloads/downlo...sb-storage-explorer-xplorer-xtaf-v44-new.html The one in the tutorial is really old, you will have a much better experience with the latest version.