Upgrade to MacOS Mojave is stuck at calculating

Went to Purchased screen.... Clicked on "Pause" while holding down Shift key. It killed the download process. Then went back and Featured and chose "Free upgrade". The process started where it left.


I encountered it too. Could be caused by an interruption in internet connection. I restarted the MacBook after waiting forever. Tried to download again from App store, and it continued from where it got stuck.