I have a special case, where the interesting content (PDF) is added weekly into the same old blogpost (wordpress). How to create the RSS feed containing links to the weekly PDFs?
On a page that has multiple items that you want to used as feed items, item selector has to return a number of items, not one. Using .entry-content as the item selector, you’re only selecting one item, which isn’t what you want. Note also that CSS selectors use the dot notation to select HTML elements using their class attribute values. To select <blockquote> elements, leave out the dot.
Here’s an example:
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thank you so much for your helpful hints.
were can i donate?
Glad that helped. 
As for donating, at the moment we fund the development of Feed Creator and our other tools from customers of the self-hosted packages and hosted premium subscriptions. For users happy who do not need the extras offered by those options, we also have a Patreon page that’s currently focused on our Push to Kindle service, but is also a way to fund development more generally: https://www.patreon.com/fivefilters