Install our script on a subfolder. 

Example: domain.com/blog

Our script is based on Laravel framework, so the root folder is /public.

With normal installation, you will have to access to domain.com/blog/public to see your site.

Will need to modify source code to make it work on subfolder.

Installation steps

- Upload our source code to source-code (in the same folder level as public_html).

- Copy folder source-code/public to public_html/blog

- Open file public_html/blog/index.php and change it to:

<?php

use Illuminate\Contracts\Http\Kernel;
use Illuminate\Http\Request;

define('LARAVEL_START', microtime(true));

/*
|--------------------------------------------------------------------------
| Check If The Application Is Under Maintenance
|--------------------------------------------------------------------------
|
| If the application is in maintenance / demo mode via the "down" command
| we will load this file so that any pre-rendered content can be shown
| instead of starting the framework, which could cause an exception.
|
*/

if (file_exists(__DIR__.'/../source-code/storage/framework/maintenance.php')) {    
    require __DIR__.'/../source-code/storage/framework/maintenance.php';
}

/*
|--------------------------------------------------------------------------
| Register The Auto Loader
|--------------------------------------------------------------------------
|
| Composer provides a convenient, automatically generated class loader for
| this application. We just need to utilize it! We'll simply require it
| into the script here so we don't need to manually load our classes.
|
*/

require __DIR__.'/../source-code/vendor/autoload.php';

/*
|--------------------------------------------------------------------------
| Run The Application
|--------------------------------------------------------------------------
|
| Once we have the application, we can handle the incoming request using
| the application's HTTP kernel. Then, we will send the response back
| to this client's browser, allowing them to enjoy our application.
|
*/

$app = require_once __DIR__.'/../source-code/bootstrap/app.php';

$app->bind('path.public', function() {        
    return __DIR__;
});

$kernel = $app->make(Kernel::class);

$response = tap($kernel->handle(    
    $request = Request::capture()
))->send();

$kernel->terminate($request, $response);

We have updated paths on this file and rebind public_path().    

$app->bind('path.public', function() {
    return __DIR__;
});

- Open source-code/.env then change:

APP_URL =http://domain.com/blog

If you want to install our script on the new subfolder name, just change blog to your-folder-name.

Reference: https://laravel-news.com/subfolder-install