rpm-ostree errors

Hi there, I'm new to Linux and I am trying to install Refind via the terminal. When I try using rpm-ostree I keep getting this error:

It may be the simple case of me doing something wrong, but I'm not sure what at this point. Any help would be appreciated ๐Ÿ™‚

(I do have the file in my downloads folder)
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Solution
Thank you for the guide. I did manage to get it installed and I am using the latest version now (I don't know where I got the other one from). I think I'm also getting the hang of rpm-ostree too. Thanks for the help.
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