These builds are automatically published with a commit to the BleachBit Git repository, so consider them to be alpha releases: less-thoroughly tested and more likely to contain bugs. Yet, they may also contain bug fixes and enhancements not available in the stable releases. All that is to say: use these with caution.
If when installing Windows Defender SmartScreen pops up a message "Windows protected your PC," then click on "More info" to install.
If you prefer a stable release, see BleachBit downloads. In either case report bugs to the bug tracker. To find out what is new, see the build history.