Tried to update to new version (5.9) of Wordpress. Site went down. Here is the  error script I see when trying to enter the site

This was the result while trying to update:

Warning: chmod(): Operation not permitted in /home/227572.cloudwaysapps.com/mkxukazsnq/public_html/wp-admin/includes/class-wp-filesystem-direct.php on line 173

Verifying the unpacked files…

Preparing to install the latest version…

Enabling Maintenance mode…

Copying the required files…

Warning: chmod(): Operation not permitted in /home/227572.cloudwaysapps.com/mkxukazsnq/public_html/wp-admin/includes/class-wp-filesystem-direct.php on line 173

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Now the site provides only a summary:

Warning: require_once(/home/227572.cloudwaysapps.com/mkxukazsnq/public_html/wp-includes/php-compat/readonly.php): failed to open stream: No such file or directory in /home/227572.cloudwaysapps.com/mkxukazsnq/public_html/wp-includes/general-template.php on line 4869

Fatal error: require_once(): Failed opening required '/home/227572.cloudwaysapps.com/mkxukazsnq/public_html/wp-includes/php-compat/readonly.php' (include_path='.:/usr/share/php') in /home/227572.cloudwaysapps.com/mkxukazsnq/public_html/wp-includes/general-template.php on line 4869

There has been a critical error on this website.

Learn more about troubleshooting WordPress.

Will you please help me by restoring my site? Should I not update my version of Wordpress in the future?