We are publishing SuperCollider 3.12.1-rc1, a release candidate for the next bugfix update. As this is a release candidate, it is meant for testing and evaluation, and it is not an official release. If no major issues are found in the release candidate, a proper release will be made in about a week. You can download it here: Release 3.12.1-rc1 · supercollider/supercollider · GitHub
The 3.12.1 release fixes compatibility with older macOS systems (10.13 and below). For the list of previous changes, see CHANGELOG.md.