brew caskでmultipassをインストールしようとすると下記のエラーが発生して

Error: Could not find PKG source file 'multipass-1.8.1+mac-Darwin.pkg', found 'multipass-1.8.1 mac-Darwin.pkg' instead.

$ brew install --cask multipass
==> Downloading https://github.com/canonical/multipass/releases/download/v1.8.1/multipass-1.8.1+mac-Darwin.pkg
######################################################################## 100.0%#=#=#
==> Installing Cask multipass
==> Running installer for multipass; your password may be necessary.
Package installers may write to any location; options such as `--appdir` are ignored.
==> Purging files for version 1.8.1 of Cask multipass
Error: Could not find PKG source file 'multipass-1.8.1+mac-Darwin.pkg', found 'multipass-1.8.1 mac-Darwin.pkg' instead.

file名の+がに変更されてエラーが発生してるみたい
file名を+方に手動で修正して解決

$ cd ~/Caches/Homebrew/downloads/
$ # f64部分は変更して
$ mv {f64}--multipass-1.8.1\ mac-Darwin.pkg {f64}--multipass-1.8.1+mac-Darwin.pkg