Hi, i have/had similar issues... i had v2.9 which failed to launch after a recent macOS update, i'm on macOS 10.14.6. So i completely uninstalled Skitch (using an app cleaner app) and downloaded a fresh copy... i now have version 2.8.1 (which seems to be working ok but no 'dark mode') and checking for updates says i'm on the latest... so, where are versions 2.8.4 and 2.9 coming from/gone? Thanks, John