Run install.php to download and install latest version of WP

install.php

<?php

$ch = curl_init();
$source = "https://wordpress.org/latest.zip";
curl_setopt( $ch, CURLOPT_URL, $source );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
$data = curl_exec ( $ch );
curl_close ( $ch );

/* save as wordpress.zip */
$destination = "wordpress.zip";
$file = fopen( $destination, "w+" );
fputs( $file, $data );
fclose( $file );

/* unzip */
$zip = new ZipArchive;
$res = $zip->open( 'wordpress.zip' );
if ( $res === TRUE ) {
	$zip->extractTo( '.' ); // directory to extract contents to
	$zip->close();
	unlink( 'wordpress.zip' );
}


recurseMove( dirname( __FILE__ ) . '/wordpress', dirname( __FILE__ ) );
rmdir( dirname( __FILE__ ) . '/wordpress' );

function recurseMove(
	string $sourceDirectory,
	string $destinationDirectory,
	string $childFolder = ''
): void {
	$directory = opendir( $sourceDirectory );

	if ( is_dir($destinationDirectory) === false ) {
		mkdir( $destinationDirectory );
	}

	if ( $childFolder !== '' ) {
		if ( is_dir( "$destinationDirectory/$childFolder" ) === false ) {
			mkdir( "$destinationDirectory/$childFolder" );
		}

		while ( ( $file = readdir( $directory ) ) !== false ) {
			if ( $file === '.' || $file === '..' ) {
				continue;
			}

			if ( is_dir( "$sourceDirectory/$file") === true ) {
				recurseMove( "$sourceDirectory/$file", "$destinationDirectory/$childFolder/$file" );
				rmdir( "$sourceDirectory/$file" );
			} else {
				copy( "$sourceDirectory/$file", "$destinationDirectory/$childFolder/$file" );
				unlink( "$sourceDirectory/$file" );
			}
		}

		closedir( $directory );

		return;
	}

	while ( ( $file = readdir( $directory ) ) !== false ) {
		if ( $file === '.' || $file === '..' ) {
			continue;
		}

		if ( is_dir( "$sourceDirectory/$file" ) === true) {
			recurseMove( "$sourceDirectory/$file", "$destinationDirectory/$file" );
			rmdir( "$sourceDirectory/$file" );
		}
		else {
			copy( "$sourceDirectory/$file", "$destinationDirectory/$file" );
			unlink( "$sourceDirectory/$file" );
		}
	}

	closedir( $directory );
}