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Problems in Windows XP


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.