Everyone’s favourite text editor has been updated, the release notes are here https://www.barebones.com/support/bbedit/current_notes.html
BBEdit 15 requires Mac OS X 11.0 or later.
For whichever version of macOS you are using, please make sure that you have updated to the latest available OS version.
This is particularly important in the case of macOS Sonoma (14.x), which contains bugs and regressions that affect BBEdit’s operation.