I'm attempting to use Parallels software to use Windows 10 on a mac mini.

[Jojolar]

Instructions are to download Windows 10 Client ARM64 Insider Preview. cannot locate this on the Microsoft, lwindows insider program. Suggestions?

[#2]

Hi,
you posted in Edge community.
to answer your question, please read the requirements carefully.

With Windows 10 on ARM Insider Preview builds, you can create 64-bit ARM (ARM64) VMs in Hyper-V on Windows 10 ARM-based PCs. Creating ARM64 VMs is not supported on x64 hardware.

ARM64 VMs are only supported on devices that meet the pre-requisites:

Windows 10 ARM-based PCs with a Microsoft SQ1, Microsoft SQ2, Qualcomm Snapdragon 8cx, or Qualcomm Snapdragon 850 processor

Windows 10 Pro or Enterprise, build 19559 or newer

Hyper-V enabled

there is no mention of mac or its processor.