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Editing: Connect.php

<?php

namespace WPForms\Lite\Admin;

use WP_Error;
use WPForms\Helpers\PluginSilentUpgrader;

/**
 * WPForms Connect.
 *
 * WPForms Connect is our service that makes it easy for non-techy users to
 * upgrade to WPForms Pro without having to manually install WPForms Pro plugin.
 *
 * @since 1.5.5
 */
class Connect {

/**
	 * Constructor.
	 *
	 * @since 1.5.5
	 */
	public function __construct() {

$this->hooks();
	}

/**
	 * Hooks.
	 *
	 * @since 1.5.5
	 */
	public function hooks() {

add_action( 'wpforms_settings_enqueue', [ $this, 'settings_enqueues' ] );
		add_action( 'wp_ajax_wpforms_connect_url', [ $this, 'generate_url' ] );
		add_action( 'wp_ajax_nopriv_wpforms_connect_process', [ $this, 'process' ] );
	}

/**
	 * Settings page enqueues.
	 *
	 * @since 1.5.5
	 */
	public function settings_enqueues() {

$min = wpforms_get_min_suffix();

wp_enqueue_script(
			'wpforms-connect',
		 	WPFORMS_PLUGIN_URL . "assets/lite/js/admin/connect{$min}.js",
			[ 'jquery' ],
		 	WPFORMS_VERSION,
			true
		);
	}

/**
	 * Generate and return WPForms Connect URL.
	 *
	 * @since 1.5.5
	 */
	public function generate_url() {

// Run a security check.
	 	check_ajax_referer( 'wpforms-admin', 'nonce' );

// Check for permissions.
		if ( ! current_user_can( 'install_plugins' ) ) {
		 	wp_send_json_error( [ 'message' => esc_html__( 'You are not allowed to install plugins.', 'wpforms-lite' ) ] );
		}

$key = ! empty( $_POST['key'] ) ? sanitize_text_field( wp_unslash( $_POST['key'] ) ) : ''; // phpcs:ignore WordPress.Security.NonceVerification

if ( empty( $key ) ) {
		 	wp_send_json_error( [ 'message' => esc_html__( 'Please enter your license key to connect.', 'wpforms-lite' ) ] );
		}

if ( wpforms()->is_pro() ) {
		 	wp_send_json_error( [ 'message' => esc_html__( 'Only the Lite version can be upgraded.', 'wpforms-lite' ) ] );
		}

// Verify pro version is not installed.
		$active = activate_plugin( 'wpforms/wpforms.php', false, false, true );

if ( ! is_wp_error( $active ) ) {

// Deactivate Lite.
			$plugin = plugin_basename( WPFORMS_PLUGIN_FILE );

deactivate_plugins( $plugin );

// phpcs:ignore WPForms.Comments.PHPDocHooks.RequiredHookDocumentation, WPForms.PHP.ValidateHooks.InvalidHookName
			do_action( 'wpforms_plugin_deactivated', $plugin );

wp_send_json_success(
				[
					'message' => esc_html__( 'WPForms Pro is installed but not activated.', 'wpforms-lite' ),
					'reload'  => true,
				]
			);
		}

// Generate URL.
		$oth        = hash( 'sha512', wp_rand() );
		$hashed_oth = hash_hmac( 'sha512', $oth, wp_salt() );

update_option( 'wpforms_connect_token', $oth );
	 	update_option( 'wpforms_connect', $key );

$version  = WPFORMS_VERSION;
		$endpoint = admin_url( 'admin-ajax.php' );
		$redirect = admin_url( 'admin.php?page=wpforms-settings' );
		$url      = add_query_arg(
			[
				'key'      => $key,
				'oth'      => $hashed_oth,
				'endpoint' => $endpoint,
				'version'  => $version,
				'siteurl'  => admin_url(),
				'homeurl'  => home_url(),
				'redirect' => rawurldecode( base64_encode( $redirect ) ), // phpcs:ignore
				'v'        => 2,
			],
			'https://upgrade.wpforms.com'
		);

wp_send_json_success(
			[
				'url'      => $url,
				'back_url' => add_query_arg(
					[
						'action' => 'wpforms_connect',
						'oth'    => $hashed_oth,
					],
					$endpoint
				),
			]
		);
	}

/**
	 * Process WPForms Connect.
	 *
	 * @since 1.5.5
	 */
	public function process() { // phpcs:ignore Generic.Metrics.CyclomaticComplexity.MaxExceeded, WPForms.PHP.HooksMethod.InvalidPlaceForAddingHooks

$error = esc_html__( 'There was an error while installing an upgrade. Please download the plugin from wpforms.com and install it manually.', 'wpforms-lite' );

// Verify params present (oth & download link).
		$post_oth = ! empty( $_REQUEST['oth'] ) ? sanitize_text_field( wp_unslash( $_REQUEST['oth'] ) ) : ''; // phpcs:ignore WordPress.Security.NonceVerification
		$post_url = ! empty( $_REQUEST['file'] ) ? esc_url_raw( wp_unslash( $_REQUEST['file'] ) ) : ''; // phpcs:ignore WordPress.Security.NonceVerification

if ( empty( $post_oth ) || empty( $post_url ) ) {
		 	wp_send_json_error( $error );
		}

// Verify oth.
		$oth = get_option( 'wpforms_connect_token' );

if ( empty( $oth ) ) {
		 	wp_send_json_error( $error );
		}

if ( hash_hmac( 'sha512', $oth, wp_salt() ) !== $post_oth ) {
		 	wp_send_json_error( $error );
		}

// Delete so cannot replay.
	 	delete_option( 'wpforms_connect_token' );

// Set the current screen to avoid undefined notices.
	 	set_current_screen( 'wpforms_page_wpforms-settings' );

// Prepare variables.
		$url = esc_url_raw(
		 	add_query_arg(
				[ 'page' => 'wpforms-settings' ],
			 	admin_url( 'admin.php' )
			)
		);

// Verify pro not activated.
		if ( wpforms()->is_pro() ) {
		 	wp_send_json_success( esc_html__( 'Plugin installed & activated.', 'wpforms-lite' ) );
		}

// Verify pro not installed.
		$active = activate_plugin( 'wpforms/wpforms.php', $url, false, true );

if ( ! is_wp_error( $active ) ) {
			$plugin = plugin_basename( WPFORMS_PLUGIN_FILE );

deactivate_plugins( $plugin );

// phpcs:ignore WPForms.Comments.PHPDocHooks.RequiredHookDocumentation, WPForms.PHP.ValidateHooks.InvalidHookName
			do_action( 'wpforms_plugin_deactivated', $plugin );

wp_send_json_success( esc_html__( 'Plugin installed & activated.', 'wpforms-lite' ) );
		}

$creds = request_filesystem_credentials( $url, '', false, false );

// Check for file system permissions.
		if ( $creds === false || ! WP_Filesystem( $creds ) ) {
		 	wp_send_json_error(
			 	esc_html__( 'There was an error while installing an upgrade. Please check file system permissions and try again. Also, you can download the plugin from wpforms.com and install it manually.', 'wpforms-lite' )
			);
		}

/*
		 * We do not need any extra credentials if we have gotten this far, so let's install the plugin.
		 */

// Do not allow WordPress to search/download translations, as this will break JS output.
	 	remove_action( 'upgrader_process_complete', [ 'Language_Pack_Upgrader', 'async_upgrade' ], 20 );

// Create the plugin upgrader with our custom skin.
		$installer = new PluginSilentUpgrader( new ConnectSkin() );

// Error check.
		if ( ! method_exists( $installer, 'install' ) ) {
		 	wp_send_json_error( $error );
		}

// Check license key.
		$key = get_option( 'wpforms_connect', false );

if ( empty( $key ) ) {
		 	wp_send_json_error(
				new WP_Error(
					'403',
				 	esc_html__( 'No key provided.', 'wpforms-lite' )
				)
			);
		}

$installer->install( $post_url ); // phpcs:ignore

// Flush the cache and return the newly installed plugin basename.
	 	wp_cache_flush();

$plugin_basename = $installer->plugin_info();

if ( $plugin_basename ) {

// Deactivate the lite version first.
			$plugin = plugin_basename( WPFORMS_PLUGIN_FILE );

deactivate_plugins( $plugin );

// phpcs:ignore WPForms.Comments.PHPDocHooks.RequiredHookDocumentation, WPForms.PHP.ValidateHooks.InvalidHookName
			do_action( 'wpforms_plugin_deactivated', $plugin );

// Activate the plugin silently.
			$activated = activate_plugin( $plugin_basename, '', false, true );

if ( ! is_wp_error( $activated ) ) {
			 	add_option( 'wpforms_install', 1 );
			 	wp_send_json_success( esc_html__( 'Plugin installed & activated.', 'wpforms-lite' ) );
			} else {
				// Reactivate the lite plugin if pro activation failed.
			 	activate_plugin( plugin_basename( WPFORMS_PLUGIN_FILE ), '', false, true );
			 	wp_send_json_error( esc_html__( 'Pro version installed but needs to be activated on the Plugins page inside your WordPress admin.', 'wpforms-lite' ) );
			}
		}

wp_send_json_error( $error );
	}
}

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