I had the same problem when trying to install Solaris 10 u8 from our old install server that is still running on Solaris 8.
My simple workaround was to remove the "$ISADIR" entries from add_install_client: == root at bali:Tools[598] # cd /files/install/sol-10_u8_i86pc/Solaris_10/Tools root at bali:Tools[599] # cp add_install_client add_install_client.ori root at bali:Tools[600] # sed 's:/\\$ISADIR::' add_install_client.ori > add_install_client == After that the net installation works like a charm from the S8 server ;-) -- This message posted from opensolaris.org