Europe had NOT been devidied between East and West, No Soviet Take over of the East No Nato Warsaw pact etc
How do you get there?
what are the alliances?To get there: the USSR is not conquered, but too badly weakened to broaden their sphere of influence. Maybe they make it to Berlin in 1947, and then break down into another Time of Troubles back home. In addition, FDR dies earlier or is voted out, the new US President is more isolationist, so the US goes home after the war is over.
No NATO means most likely no Marshall Plan means Europe takes a lot longer recovering economically. Eastern Europe may or may not be slightly better off than OTL; Western Europe is surely a lot worse off.
At a guess, various revanchist grievances in Europe, with no Cold War superpowers sitting on their respective alliances, lead to a WWIII some time in the 1960s.