The basic of the scenario is: Hitler is removed from power in 1938 after annexing the sudets, the most likely way to do that is with the
Oster conspiracy, but any other PoD can be used on it
The question is: If Hitler was removed from power after Germany had unified with Austria and taken the sudets, how would Germany be today? How big would his population be? And how strong the german economy would be?
Can't do after the annexation, as that made Hitler untouchable and broke up the Oster Conspiracy, because Hitler had been proven right and was FAR too popular as a result at all levels. If there isn't the last minute deal with Chamberlain and the Oster group gets buy in from the Brits as a result and they do successfully remove Hitler to avoid war, then that is a viable option, but that leaves Czechoslovakia intact and Austria as the only annexation (which is a huge prize actually, in 1949 the largest continental oil field was discovered in the Vienna Basin near Vienna, and there is a huge Tungsten mine in Tyrol, which is very valuable). Germany gets to keep Silesia, which was later discovered to have a huge, world class copper mine, which the Germans would love to have. Saying what would exist today as a result of Hitler being successfully removed and Germany making it through a civil war as a result (you aren't removing Hitler without push back from the Nazis) without the Nazis in charge, there will be a recession and instability in Europe, perhaps intervention by the Allies and Poland if things get bad enough.
If Germany economically stabilizes then and is able to develop an economy not predicated on military spending, nor is severely hampered by residual Nazis, then they could be quite prosperous once the Japanese war with China is dealt with and the globe stabilizes. Germany would have a fair few interested raw material suppliers that would want her industrial goods and be willing to barter given the lack of German cash at that point. Actually Germany would avoid massive losses in patents, talent, market share, and buyers (that they would not kill off), which would help them going forward. They'd be a completely different nation without WW2 and Europe would be a completely different continent without the destruction of the war and Soviet occupation. Some deal would be worked out with Poland over Danzig and the Corridor eventually and there would be deals over German minority rights in Czechoslovakia (leaving them in the Czecho-Slovak state is actually to Germany's advantage given the linguistic overlap and ability to sell their goods to the interested minority there that they can advertise to).
The USSR is actually a wild card here, because I've read some theories that without the world war legitimizing Stalin's rule he would drive the country into the ground and potentially start a civil war with his purges, paranoia, and mismanagement. He'd live a longer natural life without the stress of the war years (and extra drinking) too. That is a wild card for Europe. Back to Germany they and the rest of Europe would be richer, especially as European colonial systems fall apart more gently over a longer time frame. China could end up avoiding communism and with Japan out being a very lucrative trade partner. The Soviets too might end up being a good trade partner, as a source of cheap raw materials and food. Population-wise Germany would easily be over 100 million people by the end of the 20th century, potentially ~125 million with Austria and no wars disrupting birthrates so badly. Europe as whole would likely be a lot more populous in general. Unless there is severely mismanagement of the European economies without the war or severe political instability, the EU might well happen earlier and Europe being a lot more prosperous, especially compared to the USSR. The Soviets might well fall early for a variety of reasons, though potentially they might last longer without the damage of the war or expense of empire. They'd likely blow a ton on the military though, so that problem would remain.