After the 1st failure I uninstalled my old version & rebooted. Tried again, same failure. So I downloaded & installed the archived version (fp_10.3.183.75_archive), which has been "Blocked" by my machine because it is an old version.
1st gen Mac Pro (2006) running Lion 10.7.5
2 X 2.66 dual-core intel xeon
7 G memory
Graphics card is NVIDIA GeForce 7300 GT 256 MB
After browsing the forum I ran across this thread:
Apparently, the Online Installer sucks. I downloaded this guy:
...and it installed without a hitch. Thanks for nothing Adobe!