Older version 3.7 is garbage?

Hi there,
I am new in this forum and I will appreciate if someone can give an help.
Well, some years ago I bought one version of Cubase (Cubase Pc english - Version 3.7 - Part # 1911538-03) that I have used on older Windows. After some trouble I would like to experiment it with windows XP that I have installed in one pc, but I have read that the upgrade is possible only from the version 3.71
Any advice?