Hey,
I have checked in our local system by updating beta3, there is no such error is showing. However, if error is still showing on your system, please create a table manually:
CREATE TABLE IF NOT EXISTS `#__sellacious_order_delivery_slot` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`order_item_id` int(11) NOT NULL,
`slot_from_time` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`slot_to_time` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`full_day` TINYINT(1) NOT NULL,
`source` VARCHAR(25) NOT NULL,
`status` tinyint(1) NOT NULL,
`created` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`modified` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
Hope this helps,
Thanks