What's the exact 11.x version?
Run the liveupdate setup first to install it than install SEP
LU_Register_Decomposer_ABI.611D9A69_39FC_4998_998E_1ECADF28A979 returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)
See here:
http://www.symantec.com/docs/TECH97223
You're using an old buggy version which is why this is happening...