SEMS- Upgrade

Hi

Went through few KB docs and some other material too.

But still have some doubt on upgrade from SEMS 3.2.1 Build 4940 (MP3) to SEMS 3.3.1 build 13100 or 13266.

Can I do the upgrade directly to SEMS 3.3.1 ? with out any intermitent version upgrade?

What is the file name to download and can go with upgrade?

Thank you for your advices in advance.

Harsha