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Edit: class-file-upload-upgrader.php

<?php
/**
 * Upgrade API: File_Upload_Upgrader class
 *
 * @package WordPress
 * @subpackage Upgrader
 * @since 4.6.0
 */

/**
 * Core class used for handling file uploads.
 *
 * This class handles the upload process and passes it as if it's a local file
 * to the Upgrade/Installer functions.
 *
 * @since 2.8.0
 * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php.
 */
class File_Upload_Upgrader {

/**
	 * The full path to the file package.
	 *
	 * @since 2.8.0
	 * @var string $package
	 */
	public $package;

/**
	 * The name of the file.
	 *
	 * @since 2.8.0
	 * @var string $filename
	 */
	public $filename;

/**
	 * The ID of the attachment post for this file.
	 *
	 * @since 3.3.0
	 * @var int $id
	 */
	public $id = 0;

/**
	 * Construct the upgrader for a form.
	 *
	 * @since 2.8.0
	 *
	 * @param string $form      The name of the form the file was uploaded from.
	 * @param string $urlholder The name of the `GET` parameter that holds the filename.
	 */
	public function __construct( $form, $urlholder ) {

if ( empty( $_FILES[ $form ]['name'] ) && empty( $_GET[ $urlholder ] ) ) {
			wp_die( __( 'Please select a file' ) );
		}

// Handle a newly uploaded file. Else, assume it's already been uploaded.
		if ( ! empty( $_FILES ) ) {
			$overrides = array(
				'test_form' => false,
				'test_type' => false,
			);
			$file      = wp_handle_upload( $_FILES[ $form ], $overrides );

if ( isset( $file['error'] ) ) {
				wp_die( $file['error'] );
			}

if ( 'pluginzip' === $form || 'themezip' === $form ) {
				$archive_is_valid = false;

/** This filter is documented in wp-admin/includes/file.php */
				if ( class_exists( 'ZipArchive', false ) && apply_filters( 'unzip_file_use_ziparchive', true ) ) {
					$archive          = new ZipArchive();
					$archive_is_valid = $archive->open( $file['file'], ZIPARCHIVE::CHECKCONS );

if ( true === $archive_is_valid ) {
						$archive->close();
					}
				} else {
					require_once ABSPATH . 'wp-admin/includes/class-pclzip.php';

$archive          = new PclZip( $file['file'] );
					$archive_is_valid = is_array( $archive->properties() );
				}

if ( true !== $archive_is_valid ) {
					wp_delete_file( $file['file'] );
					wp_die( __( 'Incompatible Archive.' ) );
				}
			}

$this->filename = $_FILES[ $form ]['name'];
			$this->package  = $file['file'];

// Construct the object array.
			$object = array(
				'post_title'     => $this->filename,
				'post_content'   => $file['url'],
				'post_mime_type' => $file['type'],
				'guid'           => $file['url'],
				'context'        => 'upgrader',
				'post_status'    => 'private',
			);

// Save the data.
			$this->id = wp_insert_attachment( $object, $file['file'] );

// Schedule a cleanup for 2 hours from now in case of failed installation.
			wp_schedule_single_event( time() + 2 * HOUR_IN_SECONDS, 'upgrader_scheduled_cleanup', array( $this->id ) );

} elseif ( is_numeric( $_GET[ $urlholder ] ) ) {
			// Numeric Package = previously uploaded file, see above.
			$this->id   = (int) $_GET[ $urlholder ];
			$attachment = get_post( $this->id );
			if ( empty( $attachment ) ) {
				wp_die( __( 'Please select a file' ) );
			}

$this->filename = $attachment->post_title;
			$this->package  = get_attached_file( $attachment->ID );
		} else {
			// Else, It's set to something, Back compat for plugins using the old (pre-3.3) File_Uploader handler.
			$uploads = wp_upload_dir();
			if ( ! ( $uploads && false === $uploads['error'] ) ) {
				wp_die( $uploads['error'] );
			}

$this->filename = sanitize_file_name( $_GET[ $urlholder ] );
			$this->package  = $uploads['basedir'] . '/' . $this->filename;

if ( 0 !== strpos( realpath( $this->package ), realpath( $uploads['basedir'] ) ) ) {
				wp_die( __( 'Please select a file' ) );
			}
		}
	}

/**
	 * Delete the attachment/uploaded file.
	 *
	 * @since 3.2.2
	 *
	 * @return bool Whether the cleanup was successful.
	 */
	public function cleanup() {
		if ( $this->id ) {
			wp_delete_attachment( $this->id );

} elseif ( file_exists( $this->package ) ) {
			return @unlink( $this->package );
		}

return true;
	}
}

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