I am not sure what you expect from a "multilingual" installation of Adobe Reader. To me it appears that if you have the "multilingual" installer version, then you can select the language to install. And that will remain the installed language.
However, I haven't found from where to download the multilingual installer.
Windows has the ability to have multiple languages installed. (Microsoft Office as well). A user working on the system, can not only set his regional settings on the system, but can also select his language. So when he logs on to the system everything is displayed in his language. This is extremely helpfull in internatioal environments.
Acrobat claims being able to do this see: http://www.adobe.com/products/reader/features/ look for "MUI"
By default though only 1 language gets installed. So I can't select another.
When you look at the deployment guide it discusses something called the multilingual installer, which I have not been able to find.
So my question remains: How do I make use of this feature.
The german version of Adobe Reader comes with german and english UI.
Die franzosische version leider nicht..... When I installed the french edition, and tried to select a language, only french turned up.
Ok, I see - MUI. I would be happy to test a little bit more with this, but I still don't know from where you can download the MUI version of Adobe Reader. If I go to the FTP download site for 9.1 (ftp://ftp.adobe.com/pub/adobe/reader/win/9.x/9.1/) I see only the individual language directories, no MUI.
That is also my problem (and the reason I posted).
Sorry, I misunderstood your post. I thought that you had the MUI installer, but it would not install as a multilanguage product.
You may need to contact Adobe to get the MUI installer; I wouldn't know where to look for it.
P.S. doing a little bit more searching, now I remember that we had the same question sometime last year: http://forums.adobe.com/message/1773376 - but sorry, still unanswered.