new download norton files

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1

Hi ,

 

today when i try download new version files from norton.com interesting :

 

www.norton.com/nis20

 

http://buy-download.norton.com/downloads/2013/20.4/NISNAV/US/NIS-ESD-NODEFS-20-4-EN.exe  ( 51MB )

 

http://buy-download.norton.com/downloads/2013/20.4/NISNAV/US/NAV-ESD-NODEFS-20-4-EN.exe ( 64 MB )

 

http://buy-download.norton.com/downloads/2013/20.4/N360/US/N360-ESD-NoDefs-20-4-EN.exe ( 59MB )

 

but old files are near 150MB .

why ?

 

Thank you .