解决办法

Oh My Zsh

1. Clone this repository into $ZSH_CUSTOM/plugins (by default ~/.oh-my-zsh/custom/plugins)

git clone https://github.com/zsh-users/zsh-autosuggestions ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-autosuggestions

2. Add the plugin to the list of plugins for Oh My Zsh to load (inside ~/.zshrc):

plugins=(zsh-autosuggestions)

3. Start a new terminal session.

参考链接

Warning: plugin zsh-syntax-highlighting not found

To be fair zsh-users
has proper installation instructions depending on OS for each of those plugins

zsh-autosuggestions/INSTALL.md