There is no means to update from SP3.0 to SP3.1, because # M4 r- C4 N9 g' |0 D9 T ! C9 _( U2 D: I4 m* F3 e"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. "