Share your experience!
Thanks - I had the same problem after the Nougat upgrade on my Z5 compact, and I followed the same sequence you described and also finally had success at the final step.
Experiencing the same issue on my Z5 Compact after Nougat. Unfortunately unistalling the updates on PlayStore didn't fix it for me(I unistalled updates and restarted prior clearing the cache).
Update: PlayStore just got back to normal all by itself.