Hi. I found a torrent with several textbooks (including 123 Gremo! & Gremo Naprej).  If you're blocked from downloading torrents, let me know & I can send you the files via gmail.

Alex, Lauren, Polluxa, Trisha,
https://archive.org/download/SloveneSlovenianLanguageLearningPack
Not sure it is the same torrent though.

You likely don't need most of files:

e.g. huge files with jp2 are photographies of pages in their original quality (before being compressed into pdf)
In some cases they are much better quality in some are the same.

SOme others are result of OCR with abbyy fine reader.

Oh and Slovene Online (SLO), which is produced by the University of Ljubljana. Slovenian 101 is also a very good resource for beginners. Hope this helps, Alex :)