Can`t load iLife `09 DVD..

I`m using a Lacie DL DVD drive as neither of the above has a working internal optical drive. iLife `09 won`t mount on the desktop of either computer though it will on the iMac G5 we have here..(It`s a new family pack). I`ve tried making a disk image of iLife on the iMac in disk utility & transferring it directly to one of my external HD`s but it says the disc is too big....Would buying a new internal drive for one of these G4`s & installing be any help...( the drive in the Lacie DL DVD burner mentioned was recently replaced & works OK for anything else) The G4`s have the right specs according to what`s required on the slip in the iLife box..?