Thank you for your answer.

I had to buy the big fish games version because I kept getting the message 'unable to connect to server' and the loading screen kept getting stuck on audio initialized. Like people from this post on steam, https://steamcommunity.com/app/949050/discussions/0/1741105170030273435/

But BFG changed the tech point gain to be really slow. I'd like to play the steam version if there's a fix for the above problems.