Hey! So I hit the same wall you did. Copied that pyd file, read-only. Then launcher wouldn’t run at all. Uninstalled & re-installed. Started getting the exefile error. Uninstalled & re-installed a 3rd time, finally was good to go.
On that 3rd time I checked the SharedCache folder before actually launching the game, confirmed all the bin64/ and exefile etc. were all here. Copied them elsewhere in case they go missing again.