frostschutz, sorry for posting on the wrong thread, then. Splitting the files into sub-directories did seem to allow them all to fit on the card, so thanks for that.
h87booky, I have succeeded in doing a wget (or a series of them) to download all the books with an epub (and English) filter. I can send you the tar if you want. But are you saying you made the directory hidden on the FAT32 partition? And do the books still get indexed into your kobo library that way? How do you find them to read them on the device if they're not in the database?
Edit: Or you can do the download yourself, but for me it took all day (adding a delay of 1.1 seconds between books). I used a variation on this script (the epubs aren't unzipped, for example, so I had to change that):
https://www.exratione.com/2014/11/ho...ect-gutenberg/