Stopped importing items after adding paid plugins

I tested the free version of the WP RSS Agregator, it imported posts to db with post_type=wprss_feed_item.

Then, I installed the paid plugins and after that all feeds doesn’t import. I removed all posts post_type=wprss_feed_item from the database and now, when I click “fetch” nothing is imported. I see 0 items on each feed source.