Changing languages at upgrade

I bought a copy of Parallels desktop 5 for Mac at a local store here in Switzerland and of course (as I now find out) it's German language only. I want to get v.6 but want to have it in English.

1) Is it possible to buy an upgrade to 6 in English?
2) If I can't do (1) and buy a full version of v.6 in English any guidance on how to ensure that the new installation goes smoothly.

 

You can change localizations with Parallels Desktop 5 upgrade.
http://kb.parallels.com/6813

I assume you can do the same with Parallels Desktop 6.

The only Parallels Desktop 6 knowledge base document that mentions localizations only says that the localization you download should be the same as the localization of the upgrade key.
http://kb.parallels.com/8834

So you should try buying and downloading the English upgrade of Parallels Desktop 6.