That's really outdated.
https://github.com/mtheall/ftpd/releases is the new version.
There's also a fork. https://gbatemp.net/threads/release-ftpdb-ftpd-with-buildtools.430464/
And there's 3DS's own microSD management app. I haven't used it so I don't know how bad it is.
It's a bit of a pain with XL, but with non XL it's pretty easy. I just don't tighten the screws. It's pretty easy to pop the back plates off. FTP sucks for large files, but I guess you can use FBI to install wireless.
Thanks man apreciated =)