Can I safely delete the Blocs, Blocs2, Blocs3 and Blocs4 folders from
~/Library/Application Support? Or does v5 still use those folders?
(I realized I haven’t used any older versions of Blocs, so I’d clean up a bit …) 
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A quick test, if I move away the Blocs folder, I loose activation etc. So leave that in place.
But moving away the folders Blocs 2, Blocs 3 and Blocs 4 doesn’t seem to trigger any errors or popups upon launching Blocs 5. 