How do I turn off parental controls without a parent because the parent account is lost and...

Have you got a family account setup at all, or parental controls?

That may be the issue.

Try asking your parent/guardian to turn off their parental controls, and reply if it does not help.

If your parent/guardian does not know how to turn parental controls off, tell them to promote the Xbox Live account to an adult one, instead of a child one. You may have a child account, instead of a full adult account.

You cannot change the age but you can turn off Parental Controls. See:
support.xbox.com/.../parental-control for the steps (that document tells you how to turn them on but it is the same steps for turning them off... You can see the Off option in the image).

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.
I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today despite this Andrew

Sorry to say buddy but in order to remove parental controls for the account is necessary first yes or yes use the parent account to remove you from family group or turn off these permissions

This is due to security reasons for the child account.

Hope it helps, if you have further questions don't hesitate to ask

Greetings from another Microsoft user

support.xbox.com/.../parental-control

Just go in there and turn it off, save and exit.

Its likely because its unrated, but I am not sure why it won't download after you turned off the parental controls. What I would do is use the parent account to download it. Once that is done the other profiles on the same xbox should be able to play the
game.