Using RAR seems an odd choice. I don't think I've seen a RAR file in over 10 years.
Just for the record, I work with various technical (ie not mass market) software on daily basis and most releases of just compressed files I receive are in .rar. It is still widely used amongst devs and I use winrar myself for many, many years.
I'm a developer myself and I also use it, I have been using winrar for more than 20 years and in many cases is better than 7zip, it depends the use case. Anyway, nobody knows anything and yet they are spreading what they dont know for free, something is not right here hehe, I dont own any lhr gpu and will never buy any, so I will not need to download this program.