If he use rebug cfw he can simply copy it into devhd00/packages and install it from package manager.
I use rebug 3.41.3. I don't know if it is possible install package manager on cfw kmeaw and use it.
If he is on cfw kmeaw, he can use demomanager and to do so:
- put the package in demomanager folder
- drag/drop update onto demomanager.exe
- you'll see it creates a new folder, for example 00000018 with 3 files
- drop the pkg into this folder
- run Blackb0xFTP and upload the folder into dev_hdd0/vsh/task
- reboot PS3 and install pkg
I think this is working.