#                      ${KDE4_KDEUI_LIBS}

    # ${KDE4_KDEUI_LIBS}

No point committing commented code.

        KIO::NetAccess::mkdir(tmpUrl, m_widget, ok);

This seems wrong.

from kde4support/src/kio/netaccess.h
    static KDE4SUPPORT_DEPRECATED_EXPORT bool mkdir( const QUrl & url, QWidget* window, int permissions = -1 );


so you're casting book ok which is uninitialised to permissions - and then using that as the result.

Maybe you can explain why you had to change it?

    QVBoxLayout l;

You can't make a layout on the stack.

The lifetime of the layout needs to be as long as the RemoteInstallerDialog. This will be deleted as soon as we exit the constructor.