Windows 10 64 Bit Iso Download [better] Here

No. Microsoft's official ISOs do not allow downgrading without a clean wipe. You would need to back up data, boot from USB, delete partitions, and perform a fresh install.

During installation, when asked for a product key, you can click "I don't have a product key" to proceed with installation. You can enter a valid key later. windows 10 64 bit iso download