More limiting is the requirement for the TPM 2.0 feature that needs to be enabled via the BIOS settings if supported. You need 64-bit CPU with at least two cores and 1GHz clock speed, 4GB of RAM and 64GB of minimal internal storage. Now, it's available for download again and you can see if your hardware qualifies. It was taken down shortly after due to some controversy regarding the system requirements. Upon Windows 11's announcement, Microsoft shared a Windows 11 PC Health Check app that scans your computer to see if it's eligible for the major Windows update.
