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I am trying to install Z-Uno toolchain for Arduino IDE on raspbian "Buster" (hosted on a Raspberry pi 4)

The Z-uno documentation says Arduino IDE 1.6.5 should be used,
But there is no ARM build of Arduino 1.6.5 on the https://www.arduino.cc/en/Main/OldSoftwareReleases

I tried with 1.6.9 but get an exception in Arduino IDE when it tries to install the Z-Uno Board type

java.lang.RuntimeException: java.lang.Exception: Tool zuno_toolchain is not available for your operating system.
at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onInstallPressed$2(ContributionManagerUI.java:175)
at java.lang.Thread.run(Thread.java:748)

Has anyone got Z-Uno toolchain working on raspbian ?

No ;( Z-Uno toolchain exists only for x86, x64, OS X and Windows. No ARM, sorry

No problem, it works very nice on x64.