Yes, that’s what support told me too - that this app is not supported on my Chromebook. Yet it was playing fine until their last update. Up to that time, it seemed that when I was actively playing, and was notified of a game update, I could update with no problem. But I don’t know what happened - I left the game in the morning, to go to a dr appt, and when I came back to it in the afternoon…well, this happened. I’ve been trying to figure out something ever since.
Yes, this app came from the Google Play Store. I did do a general Google search for this app, in hopes of finding a different way to dl it. Not really, although Amazon was there, which is where I got it initially, years ago, for my Kindle devices. Playing it there was what made me want to get it when I got my new Chromebook.
Now, however, as I think I mentioned above somewhere, when I try the Google Play Store again, it shows me an option to install to my Android cellphone, or to my Chromebook. I first tried installing to my cellphone, and that worked. I then tried installing to my Chromebook. I got a blank little white box, with a green OK button. I clicked OK, then went looking for the app, but nothing. I tried it several times with the same result. Nothing.
I did try installing other stuff, just to see if it was something about the Play Store. I got a quick message about there being some unnamed problem at their end, and to try again later. I have. It’s the same - that small blank white box with the green OK button. Repeatedly.
I’ve already contacted Google “support,” but after that initial reply days ago, I’ve heard nothing more. BUT, I did get a survey asking how the Google support agent was. ROTFLMAO. I told them. That’s the last I heard, days ago.
So now I’m out of ideas. I wouldn’t want to root out my Chromebook, so that’s out.
I guess if there’s any bright side to this, now I have more time in my day, to do other things that tend to pile up when I’m engrossed in the game. 
But, I’m sure I’ve been tossed out of my club. I contacted support again on Thursday or Friday, telling of my current situation, and asking if they could please tell me the name of my (former) club. Since I know there will be no response over the weekend, I waited until maybe today for something. But so far, nothing. I’ll wait until Tuesday, maybe they’re backlogged with emails, so I guess I’ll just wait some more. 