I was downlaoding the main game again today and not just the installer ist only half as big as the older one I have the games size after installing is too.
I there something wrong with the new installer I downladed, was something removed from the game or was it just optimized since I last played it?

Current offline installer comes in separate downloads for 32-bit and 64-bit installations. Previously, were they bundled together in one download? If so that would explain why the size has halved.