Classic is the 98/ME/NT version, it uses the older installer and will not work on Vista/7/8 - and there is no Classic for Opera 12.x. Otherwise the choices are English, International and MSI ... MSI is used in corporate settings when installing to multiple computers. Barring that the English version won't have the non-English dictionaries and localizations, there are no differences once installed between any of the installers.
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