Installation failed: Could not create directory. . . /wp-content/upgrade on MacOs

This is an access issue that WordPress cannot create or edit directory “upgrade” or “plugins” or any directory shown in the error.

I encountered this issue during installing plugin on WordPress. 

To solve this:

1. Open terminal on Mac
2. Login to root by typing

sudo su

3. Change access of the upgrade directory

chmod 777 /Applications/XAMPP/xamppfiles/htdocs/akiramaria/wp-content/plugins