first relax and be patient, the install can be nightmare for some
the game downloads a file then extracts it alternating back and forth so … you may not see it downloading for long periods - that does not mean its stopped (some files may take 30+ mins for each step so up to an hour total, half of which may like like nothing is happening)
still if it stops for say an hour or more its hung up, restart the game and maybe even the pc to continue
i suggest to make sure windows itself is fully update
make sure the Microsoft Store app is fully updated (this installs/updates the ‘gaming services’ ms uses)
Then start the install again