Hello MailableSleet43,
Good day!
I'm Jericho, a fellow customer and an individual advisor. I am happy to assist you!
With regards to your concern, to check the minimum system requirements of the app. You can go to the Microsoft Store > Search for the game > Under the game, you'll find a tab saying "System Requirements". From there, you can see the system requirements for the particular app.
See link below.
https://www.microsoft.com/store/productId/9NXN8...
For the actual download size, it may actually depend if the game app is simultaneously updating then it is possible that it can increase from time to time.
But with regards to the the 150 GB requirement, this means that this is the only storage space needed for you to be able to download and run the game. This doesn't mean that the game will consume all the 150 GB space.
For other infos, see link below:
https://www.windowscentral.com/microsoft-flight...
https://www.systemrequirementslab.com/cyri/requ...
Hope that helps! Please let me know if you have other queries/concerns.
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Note: There is a non-Microsoft website mentioned. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install.