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SUBMIT YOUR IDEALiked learning about the factory versions and practising TS. Took me a lot longer than it probably should. Numbers are off from the output but after trying for ages to work out why I downloaded the solution to cross check and the numbers are pretty much the same as that (I'm assuming it's a version change?). Happy with the result.
Here's my solution. ARIMA has a lower AICC, but I believe the solution's output was created with some other tools (e.g., a community macro) or previous versions of the tools I'm using. I believe my outputs are valid; I did both ARIMA and ETS forecasting, just for extra practice.
Batch Macro
Workflow
Great Challenge!