which package to use and what

Hi,

I have not much experience and I need update PGP Universal Server 3.2.1 MP5 to Symantec Encryption Management Server 3.3 and I don´t see clearly that download package. Could someone explain in detail what each package ..?

SymantecEncryption3.3.0MP3_EncryptionDesktop10.3.0_PUP.zip
SymantecEncryption3.3.0MP3_PUP.zip
SymantecEncryptionWeb3.3.0MP3Full.zip
SymantecEncryption3.3.0_PUP.zip
SymantecEncryptionWeb3.3.0Full.zip
 

Thank you.