Where can i download .ISO for Test Versions

Where can I download the .ISO for the test version.
In this case, looking for Test Version 164 ISO.
I don’t want to overwrite the ver 163 I’m presently running.

https://nightly.ipfire.org/core164/2022-02-22%2011:38:15%20+0000-ad9d6bf5/x86_64/

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Thanks for the info.