Hello.

It seems to me that a new version of SolidWorks come out every year. Are different versions very similar but with only a few additions features? I wonder if I can just learn a verison, say 2010. Then, only learn the new features whenever a new version come out without losing anything.  (Not sure if it is worth to buy a new set of books whenever a new version comes out.) I used Solidworks for a very short period of time few years ago. I believe it wa SW2005. I need to relearn the program as I forgot most of the stuffs. On the market, there are several books on Solidworks 2010 but only a few on 2011. (In Japan, I only found books that use SW 2005-2010.) It seems that 2012 will be out in April. I wonder if I should buy books tha use only 2010 and 2011. Thanks.