Maybe useful to know for someone experiencing the same trouble: I haven’t succeeded to install 70514943 over 704 on my stage by using a usb stick. Got the the message in picture one
After trying it again, the message in picture two appeared
Not giving up, I tried to update via RigManager v239. And succeeded.
Hope this was of any help to you.
Ps: usb stick worked for previous updates. So I don’t think that the issue was there.