In my case, I can use the following method to temporarily bypass the pop-up window. See if this can help you. I'm using Android phone.
1. Force close the game. Clear the cache of the game. Shut down any internet connection, include WiFi and data.
2. Enter the game, and then the shop / Adventure levels while keeping the internet disconnected.
3. After entered the shop / Adventure levels, a "Unable to complete purchase" window will popup, you can just click the button to close it.
4. Now you can turn on the internet connection, and then buy items / play Adventure levels as normal.
5. But once you leave the shop / Adventure levels, and you want to enter the shop / Adventure levels the second time, then the ever lasting "Restoring Purchases!" message will show up. You can do nothing and can only choose to force close the game.
Hece every time you want to enter the shop / Adventure levels, you have to repeat all of the above procedures one more time.
