Subinacl - I'm So Messed Up

Good Morning. I downloaded and installed subinacl and that went in fine. Then I tried to fix ownerships using script I found here. When I tried to run the script it told me access denied. The original problem is "A required privilege is not held by the client". I'm having a problem downloading anything then trying to run (install) it. I am using w10.
Help....................
Thank You!

 

I have no intention of installing this so all I can do is point you to help.

What the switches mean
https://www.vanstechelman.eu/windows/how_to_use_subinacl

If you read the statement at the bottom the bottom of the above link it says

So perhaps access is denied because you are missing something that is needed.