Mac如何安装unrar以及报错解决方法

使用macbook安装unrar时经常会发生报错无法正常安装，下面给介绍一下其解决方法：

尝试：

brew install unrar

尝试：
brew install unrar
报错，提示：
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/cask).
==> Updated Casks
Updated 1 cask.

==> Searching for similarly named formulae...
Error: No similarly named formulae found.
Error: No available formula or cask with the name "unrar".
==> Searching for a previously deleted formula (in the last month)...
Error: No previously deleted formula found.
==> Searching taps on GitHub...
Error: No formulae found in taps.

解决方法：
brew install carlocab/personal/unrar