==> Upgrading 1 outdated package:
tigase/tigase/beagleim 4.0 -> 4.1
==> Upgrading beagleim
==> Downloading https://github.com/tigase/beagle-im/releases/download/4.1/Beagle
==> Downloading from https://github-production-release-asset-2e65be.s3.amazonaws
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==> Verifying SHA-256 checksum for Cask 'beagleim'.
==> Backing App 'BeagleIM.app' up to '/usr/local/Caskroom/beagleim/4.0/BeagleIM.
==> Removing App '/Applications/BeagleIM.app'.
==> Purging files for version 4.1 of Cask beagleim
==> Purging files for version 4.1 of Cask beagleim
Warning: Reverting upgrade for Cask beagleim
==> Moving App 'BeagleIM.app' to '/Applications/BeagleIM.app'.
Error: tigase/tigase/beagleim: It seems the App source '/usr/local/Caskroom/beagleim/4.1/BeagleIM.app' is not there.

~$ brew cask uninstall beagleim
==> Uninstalling Cask beagleim
==> Backing App 'BeagleIM.app' up to '/usr/local/Caskroom/beagleim/4.0/BeagleIM.
==> Removing App '/Applications/BeagleIM.app'.
==> Purging files for version 4.0 of Cask beagleim

~$ brew cask install beagleim
==> Downloading https://github.com/tigase/beagle-im/releases/download/4.1/Beagle
Already downloaded: /Users/michael/Library/Caches/Homebrew/downloads/7e02998e77bf06bada766b925d8a4d4d836206bb0e5b0b81294049059f57d0b9--BeagleIM.4.1.zip
==> Verifying SHA-256 checksum for Cask 'beagleim'.
==> Installing Cask beagleim
==> Purging files for version 4.1 of Cask beagleim
Error: It seems the App source '/usr/local/Caskroom/beagleim/4.1/BeagleIM.app' is not there.