makedir DH0:LHA
cd USB0:
cd Amiga/Apps
copy lha.run dh0:LHA/
cd dh0:LHA
lha.run
that is if your hard disk is DH0:
i dont have my 600GS yet so i dont know the hard disk name
lha.run is a self extracting file
within will be a version of LhA for different processors
try the one called LhA_68k