You can scroll to the bottom of this article to see an update for 2019 which looks at other indexing alternatives which may be worth testing.
This update looks at a new post in 2019:
We recently found a new article which set out to see if there were, indeed, any viable alternatives to BacklinksIndexer. The link which was just referenced here will show you a comparison of 5 of the top indexing services and provides you with some pros and cons as to what the best choice currently is. Spoiler alert...I think you know 🙂