you don't need a whole pc to download winrar... it's on the playstore and ISO store?... so you can use your phone too.
I'm not sure what offense you're taking here, seeing as it's entirely free.
sorry if i offended you, as that wasn't my intention... i just wanted to give you advice for your problem.
if you need help on how to use winrar to open the zipped file, i can give you advice on that too.