I am going to share to test WordPress 7.0 in a safe, non-production environment, such as a staging site or WordPress Playground. Testing on a live site is strongly discouraged due to potential instability.

How to Install WordPress 7.0 for Testing

Once your testing environment is ready, you can install the WordPress 7.0 Beta or Release Candidate (RC) version using one of the following methods:

1. Using the WordPress Beta Tester Plugin (Easiest)
Install and activate the WordPress Beta Tester plugin on your test site.
Navigate to Tools → Beta Testing.
Select the “Bleeding edge” channel and “Beta/RC Only” stream, then click Save Changes.
Go to Dashboard → Updates and install the latest WordPress 7.0 version.
2. Via Direct Download
Download the WordPress 7.0 zip file from the official WordPress.org announcements.
Install it manually on your test environment.
3. Using WP-CLI (Advanced)

Run the following command in your terminal:

wp core update –version=7.0-RC1
Replace RC1 with the latest available beta or release candidate version.