Why am I unable to install plugins on WP due to Error 403?

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Error 403 means "Forbidden" and indicates that the server understands the request being made but refuses to fulfill it. This error can occur when you try to install a WordPress plugin for a variety of reasons. Some possible reasons might include:

1. Your web server has security settings in place that prevent the installation of plugins.

2. The user permissions for your account are not set to allow you to install plugins.

3. An overly aggressive security plugin is blocking the installation of new plugins.

4. A plugin you have previously installed is causing a conflict that is preventing new plugins from being installed.

To troubleshoot this issue, you can try disabling all of your existing plugins and then attempting to install the plugin again. If that doesn't work, you may need to check your web server's security settings or consult with your web hosting provider to resolve the issue.