Hi Jozko,
the program is available, just tried it myself.
Could it be you are not logged in?
As for the difference between the 2 program,
CPEA-EVAL-R80.30 is Check Point Main Train Public EA program that support the 2.6 kernel for Security Gateway and VSX
CPEA-EVAL-R80.30-3.10 is the R80.30 3.10 Kernel support for Security Gateway and VSX
You will need CPEA-EVAL-R80.30 to use as the Security Management Server for CPEA-EVAL-R80.30-3.10.
the download section contains all of the relevant links
HTH
Shlomi