Actually @kefitz1132 are you using Facebook? Several other people have complained about the same issue as you. This being the case your issue has more than likely been caused by Facebook.
Hello @kefitz1132 are you using the correct choice when you login to you game. Please use the Log in with email option when you sign in and not the Sign up with email option
Funny how King remidied it within days but can't solve any other glitches that have been floating about for a year or more. I also think it is funny how they didn't ask which platform the problem was…
Hello @Amirkhanum boosters are already saved to your device, so that you can play offline. What is it you are actually asking for? Boosters can't be moved from one device to another.