You also need to edit the hook settings on line 318 from
\IPS\Output::i()->redirect( \IPS\Http\Url::internal( 'app=downloads&module=settings&controller=settings&do=mailer' ),
to
\IPS\Output::i()->redirect( \IPS\Http\Url::internal( 'app=downloads&module=downloads&controller=settings&do=mailer' ),
line 341 from
\IPS\Http\Url::internal( "app=downloads&module=settings&controller=settings&do=mailerSend&id=" . intval(
to
\IPS\Http\Url::internal( "app=downloads&module=downloads&controller=settings&do=mailerSend&id=" . intval(
line 383 from
\IPS\Output::i()->redirect( \IPS\Http\Url::internal( 'app=downloads&module=settings&controller=settings&do=mailer' ), 'bm_sparkpost_sent' );
to
\IPS\Output::i()->redirect( \IPS\Http\Url::internal( 'app=downloads&module=downloads&controller=settings&do=mailer' ), 'bm_sparkpost_sent' );
as it is not directing to the correct modules