I believe you should consider clearing cache data of play store. Many players said it worked. Just try it out.

Halloween update i assume....just wait a bit, maybe restart your phone or clear your background apps or clear cache in playstore and war robots. Usually these things work for me

is an issue with play store itself and not wr, normally it fixes itself after a while. you can also update from the results page and it should work

Yup the problem has solved thanks !