I recently updated my Anki and my heat map was not showing up so I downloaded the 2022 heat map and it’s still not showing.
I had to uninstall it and then re-install it before it started working again. Make sure to restart Anki in between as well.
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Exactly, as @O3nnM7LP5GzFMBS mentioned: Please head to Tools → Add-ons from Anki’s main screen, find the old unsupported version of the add-on in the list (it could be named “ReviewHeatmap”, or “Heatmap”), and then install the official version from here: Review Heatmap - AnkiWeb
Once you restart Anki, everything should be up and running again.