On October 02, 2019 an anonymous blog commenter reported something that appears to be an update problem. From https://blog.torproject.org/comment/284256#comment-284256:
Anonymous (not verified) said: partial update is not clean; logs: NS_main: unable to remove directory: tobedeleted, err: 41 boklm said: Where/when do you have this error? Anonymous (not verified) said: Win 10 x64
Start: None
Due: None