There could be several reasons for this. First off there are two license dialogs:
- one for pre-install prerequisites configurable from the Dialogs page -> Bootstrapper UI
- the other (LicenseAgreementDlg) is displayed during the main installation and can be configured from the First Time Install
tree on the same page
If you're dealing with a localization issue, you should follow How do I localize the EULA and ReadMe text?
user guide article.
All the best,