Missing API endpoints?

[Schaken]

I am working on an application using C#. I am trying to get the endpoints for OLD versions of Download files.

 

As I look at this (AND TRIED IT) I cannot get this. I tried with a OAuth2 connection, and RestAPI. it tells me:

9/27/2022 6:41:17 PM: Received: {
    "errorCode": "3S291\/2",
    "errorMessage": "BAD_METHOD"
}

Is there a way to access the old versions of files? I know we can on our sites, I have that enabled.

[Schaken]

I asked this question just a bit too early. I figured it out finally. 
https://MySite.com/api/downloads/files/143?version=1420