Installing an older version of WordPress on a live website can be a bit more complicated than a fresh installation, and it's not recommended to use an old version of WordPress as it may have security vulnerabilities. However, if you must install an old version, here are some general steps that may apply:

Create a backup of your live website, including the database and all files. This will ensure that you can restore your website if something goes wrong during the installation process.
Download the desired version of WordPress from the official WordPress website.
Unzip the downloaded file to a directory on your local computer.
Connect to your website using an FTP client, and navigate to the root directory of your website. This is typically the directory where the wp-config.php file is located.
Delete all files and folders from the root directory of your website, except the wp-config.php file and the wp-content folder.
Upload the files from the unzipped WordPress directory to the root directory of your website.
Go to your website's URL, and follow the instructions for the WordPress installation process.
Import your backup database to the new version of WordPress

It's important to note that this process may cause some issues with your website's functionality, and plugin compatibility, so it's best to test your website thoroughly after making the change to ensure that everything is working correctly.

Some Other Procedures:

1. Go to File manager Upload your WordPress example wordpress-5.8.1

2. Extract the Zip to Public_html

3. Go to Your Domain: Example https://lakashighschool.com/wp-admin/setup-config.php

4. Welcome to WordPress. Before getting started, we need some information on the database. You will need to know the following items before proceeding.

Database name
Database username
Database password
Database host
Table prefix (if you want to run more than one WordPress in a single database)

We’re going to use this information to create a wp-config.php file. If for any reason this automatic file creation doesn’t work, don’t worry. All this does is fill in the database information to a configuration file. You may also simply open wp-config-sample.php in a text editor, fill in your information, and save it as wp-config.php. Need more help? We got it.

In all likelihood, these items were supplied to you by your Web Host. If you don’t have this information, then you will need to contact them before you can continue. If you’re all ready…

5. Go to your my Sql database