mkdir bea
cd bea
unzip <location>/platform812_linux32.bin

now
cat AUTORUN.INF
and run one of the java commands in there
java -mx256m -cp .:bids.jar:
3rdparty.jar:
comdev.jar:
wizard.jar:
wls8120_242_COMP_linux32.jar:
wlp8120_242_COMP_linux32.jar:
wli8120_242_COMP_linux32.jar:
psu8120_242_COMP_linux32.jar:
wlw8120_242_COMP_linux32.jar com.bea.plateng.wizard.WizardController

This will launch the installer. Point it at your current bea install when asking for a bea home, and you should be good!

X11 comes on your 3rd Panther disk. see http://www.apple.com/macosx/x11 for more info.

Sorry for the late response,
Tarun