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Apple has released macOS Catalina 10.15 Beta 5 to the developers



General
New Features
Installing third party kernel extensions now requires that you restart your Mac before they’re permitted to load. (50340461)

Known Issues
If you use Quick Look to preview an HTML document, the app you’re using might quit unexpectedly. (53330705)

During installation of macOS 10.15 you might be prompted to enter your administrator password multiple times to allow installation to proceed. (51206649)

Resolved Issues
Your Secure Token correctly remains when FileVault is enabled on a non-APFS formatted volume while upgrading to macOS Catalina 10.15. (51091312)

Deprecations
macOS frameworks are now thinned for the x86-64 architecture. Apps that execute i386 code now fail with the EBADARCH error code. The remaining stub frameworks are nonfunctional and exist only for compatibility purposes. (51236070)
  macOS Catalina 10.15 Beta 5 released