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autosandbox/sandbox/safezone components have NEVER worked in WinXP 64-bit (virtualization driver isn’t loaded on this OS, because WinXP 64-bit is old system and it doesn’t contain several internal libraries which are required by our sandbox)
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prior to build 1203, all avast versions contained a bug in UI where you saw autosandbox options even for WinXP 64-bit OS – please note, UI is separated from avast components (UI just sends commands to the components to do a work - it’s only a thin communication layer; for example, when UI in 1203 sent autosandbox’s commands to this component, they were never completed, because this component was missing on this OS)
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so, if you got an autosandboxed popup in UI, it actually never worked, because the main autosandbox component was missing and not working on this OS