There is no means to update from SP3.0 to SP3.1, because ( H$ d" I+ m2 H/ h9 W" i6 s4 }9 }0 l6 { 8 X# e$ P8 G5 j8 l"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. "