1) Am I need to install 2 different version of the AEA? (installation package named ****epp.exe and ****epsp.exe)

Yes, you need two AEA. One AEA to manage avast! Endpoint Protection Suite Plus (5 servers) and other AEA to manage [b]avast! Endpoint Protection Plus /b. Every AEA only can manage one avast! business product, you cannot combine avast! Endpoint Protection Suite Plus and avast! Endpoint Protection Plus in the same AEA.

2) I have already install the AEA for Endpoint Production Plus in Server08 R2 (with SQL Express). But when I try to install the other AEA (for Endpoint Production Plus Suits), it prompt me that that version was an old one and cannot be installed. Amy I need to install the two AEA console into two difference server for management?

You cannot use the same machine to install two AES/AEA. They use the same TCP ports.

IMHO, I’ll only install an AEA console to manage all the worksations with avast! Endpoint Protection Plus and for the 5 servers I’ll make a standalone installation.