There are a few ways you can install an older version of WordPress on a new WordPress site. You can use a plugin like WP Migrate DB or a manual process.
WP Migrate DB is a plugin that automates the process of migrating your WordPress database to a new version. This plugin is available as a free and premium plugin.
You can use the premium version to migrate multiple sites at once.
To use WP Migrate DB, you first need to install the plugin. After you install the plugin, you will need to create a migration profile.
The migration profile will tell WP Migrate DB how to migrate your WordPress site.
Next, you will need to create a new WordPress site. Once you have created the new WordPress site, you can use the migration wizard to migrate your WordPress site.
The migration wizard will walk you through the entire process.
Overall, using WP Migrate DB is the fastest way to migrate your WordPress site to a new version. However, it is not the only way.
You can also use a manual process to migrate your WordPress site to a new version.