Hello, First, I'd like to thank you guys for making this great tool avaliable for free, I'm an engineering student and I'm sure it will be extremely useful. I have just one problem, my PC is running Windows XP, and I downloaded the file from the mail I recieved after filling the form thinking it was ST4 (the last version supported on XP). But after opening it I found that it was ST5 and couldn't finally install it. Is there any way to download the ST4 version? Thanks in advance.