[Bug #204713] Under some circumstances, no input cursor is visible in the text field of the dialog box. This error is caused by interactions between the Java libraries and the platform-specific Windows libraries. Usually, it is not a problem if you are directly connected to the system on which you are running the installer. The cursor is set to the first text field, so when you start typing, the characters are entered into that field.
Workaround: If no cursor is visible, click in the field in the dialog box before entering characters. Alternatively, you can minimize the Studio Installer window, then maximize it.