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You can fix it by replacing Code in the file:

ROOT/wp-admin/includes/class-bulk-upgrader-skin.php

Old Code:


if ( $this->result && ! is_wp_error( $this->result ) ) {
	if ( ! $this->error ) {
		echo '<div class="updated js-update-details" data-update-details="progress-' . esc_attr( $this->upgrader->update_current ) . '">' .
			'<p>' . sprintf( $this->upgrader->strings['skin_update_successful'], $title ) .
			' <button type="button" class="hide-if-no-js button-link js-update-details-toggle" aria-expanded="false">' . __( 'Show details.' ) . '</button>' .
			'</p></div>';
	}

	echo '<script type="text/javascript">jQuery(\'.waiting-' . esc_js($this->upgrader->update_current) . '\').hide();</script>';
}

New Code:


if ( $this->result && ! is_wp_error( $this->result ) ) {
	if ( ! $this->error )
		echo '<div class="updated"><p>' . sprintf($this->upgrader->strings['skin_update_successful'], $title, 'jQuery(\'#progress-' . esc_js($this->upgrader->update_current) . '\').toggle();jQuery(\'span\', this).toggle(); return false;') . '</p></div>';
	echo '<script type="text/javascript">jQuery(\'.waiting-' . esc_js($this->upgrader->update_current) . '\').hide();</script>';
}

See detailed instructions in the video:

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