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Update 05/23/2020: Since the original post dated May 16, 2020, several additional aircraft have been upgraded including the C182 Skylane, Comanche 250, and T-6 Texan.
The team at A2A Simulations continues to push out P3Dv5 compatibility upgrades for a growing percentage of their product catalogue. So far, the list of P3Dv5 compatible products includes the J-3 Cub, Bonanza, P-51D Civilian, Cherokee 180, C172 Trainer, Accu-Feel, and of course, the temporarily free P-40 Warhawk.
For those affected, the above-noted upgrades are now available for download (free of charge) via your A2A account. Third-party retailers should receive the updated files very soon. Please note and for clarification purposes, it is possible to install these items side by side in both P3Dv4 and P3Dv5.