I tried the trial version and know I only have 3 tries. But will not download any audiobook, and with ebooks I was only able to download 1 book, the others kept hanging/getting an error. So out of the 3 tries, only 1 worked, if you're lucky. Every error is counted as a successful download.
Thank you for using our software. Can you please screenshot the error message and send it to us? Also, please send us the log to us so we can check this issue further. You can find log here: C:\Users\user name\Epubor EverandDownloader\logs