Unfortunately, the Pro version is subscription only ($90/year).
I use the free version so I'm limited to 150 feeds, which is enough for my use. And although I like some of the other pro features, I can't justify paying the high subscription price.
Using the pro version for years - they regularly have sales where you get 50% more time per € so it's not nearly as expensive if you stock up for 2+years if they do that