Manual WordPress installation on Plesk server fails with Error 403

Symptoms

• WordPress instance installed via WordPress Toolkit is available.
• Adding a new standalone WordPress installation in the new directory by downloading it from WordPress.org and extracting it, gets a 403 Forbidden error when trying to add the new WordPress instance via WordPress Toolkit.

Cause

WordPress Toolkit has a set of regular expressions to improve security, and setup-config.php file is blocked by the "Block access to sensitive files" security rule.

General bug EXTWPTOOLK-5081.

Resolution

Disable the Block access to sensitive files option with the following steps:

1. Go to the Extensions > WordPress Toolkit > Open > Security:
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2. Flag required website and click Revert button:
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3.  Find Block access to sensitive files rule, disable flag, and click revert.