This is without a doubt the worst experience I have ever had with a plugin.
If you don't want to read this lengthy review, then here's a short, but helpful suggestion: Go to WP RSS Multi-Importer. https://wordpress.org/plugins/wp-rss-multi-importer/ [I am not affiliated in any way with RSS Multi-Importer.] I tried MultImporter after this stupid plugin and it is way better. Plus, it's free. The reviews for the Multi-Importer are 5 stars across the board. I would gladly pay the same amount or the MultImporter as I did for WP RSS Aggregator.
As for the Aggregator Plugin--if you go this route, you are not prepared for the profound stupidity that you encounter will with WP RSS Aggregator. How do I know this? Because you can read. You've been forewarned.
To begin, the performance of the plugin is terrible. To achieve even the most basic functionality that one would expect from an RSS plugin, you have to add additional code to your cPanel.
And adding feeds? Plan on about 5 hours to add 50 feeds. Seriously, I could not believe how slow, laborious and clunky this simple task was.
Now, as bad as the plugin is, the crew at this outfit is even worse.
You will NOT get your money back.
Even though their Sales Page (i.e. FAQ Page) specifically states "Yes [we offer refunds]. If we cannot help you solve any issues you may have with the plugin within 14 days of your purchase, we will give you a full refund. No refunds are given beyond 14 days after your purchase."
Do they honor that?
No way. Even though they say they offer refunds, it turns out they have some other "Refund Policy". And the Refund Policy is different: It says they will only give you a refund if the "plugin does not work as intended". And guess who determines that vague phrase "as intended"? You guessed it: WP RSS Aggregator.
They-will-not-refund-your-money.
I know this review is too long, but these guys are terrible. Stay away and go with WP RSS Multi-Importer.
And one last thing before I go, because it's too funny (and ridiculous not to share): At the end of this ordeal, I made a final plea for a refund.
And their response:
They gave me some code to add another plugin...to address the deficiencies with their own plugin!
I-could-not-believe-it.