The mirror update and tests still work, but the actual data transfer fails after about 23KB. Known-bad versions include: 3.4.5 3.5.6 3.6.2 4.0.0-beta1 4.0.0 and 3.3.7 is probably broken too. The most specific error printed is `write error: Broken pipe (32)`. Upstream issues: https://github.com/openssl/openssl/issues/30925 https://github.com/RsyncProject/rsync/issues/869 This regression was rolled out in Arch Linux and now msys2 and Debian as well. Windows users with the broken version will have to manually replace files (see comment) to get their autobuild updater working again. Linux users will have to upgrade or downgrade their openssl package. NB: if your Xonotic files are already up to date you may not see this issue even with a broken version, as the error only occurs with a large enough data transfer.