I figured something like that. Most installers act that way nowadays. I hate it.
But most of the time you can still change the language in the program itself. Just because someone resides in a certain country, that doesn't mean he/she uses that language on his computer. I know I don't. No matter where I am, I like to keep everything in English. In this case I had to resort to deleting the Dutch languagefile to make the program switch to English. Bit of a drastic solution in my book.