201xxxxx-005-i32.exe file are intelligent updaters.
whenever there is a new virus, symantec would immediately create a defs and these defs would be applied as intelligent updaters. for normal update you can use the link posted by Sebastin. they would still work and its all the same.
If you still need it ,here it is
ftp://ftp.symantec.com/public/english_us_canada/antivirus_definitions/symantec_antivirus_corp
Symantec antivirus corporate 10.2