There is no means to update from SP3.0 to SP3.1, because $ U( _8 u% {6 d' q7 Q* m# ?% H0 z$ x$ o+ s0 T1 G& R3 K
"Please note that the only difference between SolidWorks 2008 SP3.0 and SP3.1 is production support for Microsoft Windows Vista 64-bit, so it is not necessary for customers on other operating systems to download this Service Pack. "