Your domain name or sub-domain should have the root directory set to the /public/ folder of the script, the .htaccess files are in the public folder as well. If you don't set it you can face errors.
The script contains a /public folder which handles all the requests, you need to extract the script in your /public_html/ folder of the hosting and configure the root directory of your hosting to serve files from /public_html/public/
For example https://domain.com should serve files from /public_html/public/ folder.
Make sure you uploaded the .htaccess file! This file is found inside of the /public folder and it may appear hidden on your pc and if not uploaded, it will produce a 404 Error on any link you click on the website.
5. Prepare the product files
You need to set the permissions (CHMOD) of the base folder, sub-folder and files to either 755, 775, or 777 which will depend on your actual server.
APP URL is your domain name (eg. https://domain.com or https://tiktok.domain.com), it's useful when you want to install the script in sub-domain.
6. Start the installation process
Access the product on your website and access the /install path. (ex: https://yourdomain.com/install)
Follow the steps in the installation process
You can now access the website and login with your admin account