A new stable version has been released. Changes in FS-UAE 3.0.1:

• Fix video scaling when restoring from fullscreen on Windows.

Changes in FS-UAE Launcher 3.0.1:

• Scanner bug prevented Conquests of the Longbow WHDLoad to be recognized.
• The correct kickstart wasn’t always loaded.
• Cloanto ROMs were not always decrypted.
• Fix for global WHDLoad quit key.

I have some issues getting the app to work without warning on macOS 10.15 due to the new security/notarization features on macOS, and absence of useful error messages when stuff don’t work. You can right click and choose open to bypass the strict security checks until I’ve worked this out. [EDIT: Looks like it is fixed now -> 3.0.1u1]