Why when i launch expansion for explorer i only see a white page (i reseted m'y Xbox before...

You mean on xbox 360?

It's a discontinued browser you will find issues as internet explorer is too ancient to run on today's html

Try to launch the game. Under the Cinematics page, find The Taken King. It should allow you to install that content from there.

I did it immediately after purchase. But I saw only an empty page which immediately closed and then other page where I can download only "Expansion I" and "Expansion II".

I bought the cyberpunk 2077 xbox bundle, the game is not for sale yet, but when the console start the initial configuration, ask if i want to install 3 things, xbox game pass, the game and the expansion. And on the expansion give a error and said to install
later, but after that i dont see it anywere. The game only install a shortcut saying that i own the game when it releases, so the only problem is i dont see where is the free expansion is to install on my account/library

if its like taken king or forsaken level expansion then im interested

i havent kept up with whats happening so will see when it launches

As of the restart the Xbox App seems to be loading forever on the "Launching the Xbox App" screen and the Sign in white screen continues on the Game Bar even after resetting the MS store and resigning in to it.

Meaning that as of right now the only temporary fix is to reset Both the Xbox App and Game Bar everytime it first opens after it crashes (as it often does) or when I restart the computer. Which is quite a hassle because it resets the layout of the widgets and all the sound settings I change within it