1. Check if the folder wp-content/plugins/ is not exist, create it by yourself.

2.Check etc/https.conf the User and Group setting value (it might be daomon )

3.set the owner and group for project owner. (if the macos login user is abc, project folder is project) :

cd /Applications/XAMPP/xamppfiles/htdocs/project
sudo chown -R abc:daemon
sudo chmod -R 775 .

4.Reload plugin page and try to install