This is perhaps a pre-alpha version of the software. If the publisher would mention that on the website and not to try to charge $10 for it, I would give it 4 stars.
In the end - after trial and failure - it does what it's supposed to do - create a PDF file from an Evernote note. I don't know how I managed it in the end - I think either by a) dragging to note into the interface, or b) exporting note file and dragging into interface or c) opening the exported evernote file with Everdump. Not sure which way was working, because the interface is so horrible raw and unpolished that I have no idea what is actually working.
Why is this app needed? Because Evernote can't make a PDF and export it from a note which contains 1.text, 2.PDF document, 3.picture, d.word document ... all in one file. Instead, Evernote would dump all separately so I would end up using Preview to stitch them together.
Perhaps there are other PDF maker applications capable of combining content of a Evernote file into PDF, but I wasn't able to find one (even Adobe can't do that, so I assume it's an issue with Evernote).
Everdumb helps, even through the program is still in the "dumB" phase as it is and the publisher shouldn't charge a penny.