Michael wrote (2021-04-13):

 MD> I see. There is a possibility that some bug in the code manifests itself
 MD> only on a 64-bit ARM device. If some owner of such a device finds the
 MD> bug, it can be fixed. But I am not inclined to buy a Raspberry Pi just to
 MD> see whether there is such a bug or not, sorry.

 MD> In the meantime, you may use a 32-bit OS.

You could use qemu to emulate an (virtual) aarch64 machine (or an raspberry)

https://futurewei-cloud.github.io/ARM-Datacenter/qemu/how-to-launch-aarch64-vm/

or someone could set it up and give you remote access.

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