Critical System Protection

Which is the latest SCSP version?

5.2 RU9 MP6

http://www.symantec.com/business/support/index?page=landing&key=52463

Thank you. Is it still active, even after SDCSS-Advanced?

I believe it has been re-branded:

https://www-secure.symantec.com/connect/forums/announcing-data-center-security-server-server-advanced-products

Thank you, let me reframe my question:

Is SCSP 5.2 version still available, and supported?

Also, could I get a trial version?

Yes, it should still be supported thru 3/3/17 when it goes end of support life, however it has already started the end of life phase:

http://www.symantec.com/business/support/index?page=releasedetails&key=52463

A trial is not available on their site. You 'll need to contact them.