Anyone update me on this please.

I would like to upgrade this sles 10 sp1 to sles s4 then sles sp2 as per the novell recommendation here; should i download the x86bit ISO since the "uname -a" shows #1 SMP i686 i686 i386, i guess this is the x86 bit os. am i right? or 64bit? please suggest me.
Also is the SLES sp2 free cost if i want to download and upgrade on the existing SLES os? I am concern about my lotus domino server on current sles sp1 it should not get affected after upgraded into the latest SLES sp2.

Your suggestion on this would be greatly appreciated thanks.