�� �� �� �� * (docs) from readme file it's not clear whether I have to run the update command; running it will brick the installation

Update is not mandatory, but should be a useful way to get the latest version. I'm not sure of having understood you, is that you tried it and it failed?

Indeed.

First of all, if I try to clone without ssh key I get an error

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This is non-problem for me as I just forgot to give the key to the agent.

However if I then (in a fresh pharo, so unrelated by the error above) run it with the key, I get the following warning

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If I proceed, the updated finishes, but opening Iceberg gives me this error

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Peter