First create a response.ini with the following content (feel free to change the settings you need)
##########################
# InitDialogs
#
SetupUILanguage=en
# requires a trailing slash ..
InstallDir=c:\Program Files\SAP BusinessObjects\
##################
# Selected LanguagePacks
#
SelectedLanguagePacks=de
##########################
# SelectInstancesToInstall
#
RegisteredUser=[PUT YOUR USERNAME HERE]
RegisteredCompany=[PUT YOUR COMPANY HERE]
ProductKey=[PUT YOUR PRODUCT CODE HERE]
InstallType=Default
Now run setup
setup.exe -r response.ini
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