I found Transfer 1.2.2.9 using Wayback machine. Unfortunately the windows version was not available anymore.
Elektron_Transfer_1.2.2.9_macOS.zip (3.2 MB)
Windows version from my download folder:
Elektron_Transfer_1.2.2.9_win.zip (3.6 MB)
Thanks 1000 times
just had this same issue.
was due to having a $ in my folder name on the rytm. illegal character during the transfer i guess. works after changing it to an S instead. was driving me crazy.
I’m having a similar issue with the same error message.
I tracked it down to having a single sample with ‘0’ in the title instead of ‘o’. The file is reading as a directory instead of a sample when I view the RAM, every sample has MB next to it except this reads as (d).
It won’t let me delete or rename it. But it’s still in a project sample pool and playing correctly.
Does anyone have any ideas? I already tried using an older version of transfer (1.2) as suggested. It’s preventing me from backing up my projects.
Thanks
This ______. 
Absolutely the most frustrating part about the RYTM.
RYTM 1.70
Transfer 1.8.6
Samples go in, but the never come out unless you record them 
I’ve done the work arounds plenty of times, I was hoping they fixed this mess.
thx man, it just worked
Doing the lords work - thank you.