Today, Microsoft pushed Windows 10 Insider Preview Build 19624 to Fast Ring channel, and at the same time, Microsoft also launched Windows 10 Insider Preview Build 19619 ISO image.
Interested users can upgrade the current system through this image file, or install the latest version of the image on the virtual machine through the virtual machine software.
However, in principle, it is not recommended that you install Windows 10 Insider Preview Build directly on the physical machine, and it is not recommended to upgrade the stable version to the test version directly because it cannot be returned after the upgrade.
Note that after upgrading the new version, the old version will be retained for 10 days. Within 10 days of installation, you can roll back the old version through the set rollback. After that, the old version is no longer exist.