Plugin author has updated to new version that works, but if you’re using it, please check your site. You might have to delete the old plugin through FTP and re-install latest version. This is a plugin I recommend, but stuff happens. Plugin author was quick to respond.
This was the error message on my site:
Parse error: syntax error, unexpected ')', expecting :: (T_PAAMAYIM_NEKUDOTAYIM) in /public_html/wp-content/plugins/ewww-image-optimizer/common.php on line 1764