Hello! Thank you for your question. Personally, I read the KKM manga online in Japanese. I get them from this website: http://www.ebookjapan.jp/ebj/ You can find all the volumes by searching 今日から(マ)のつく自由業! They are about $5 a volume. They are also available at Honto (http://honto.jp/) in ebook and physical copies. The site is currently doing maintenance and in general their reader doesn’t work for me, so I only use them for physical copies (they ship internationally).
If you meant downloading them for free, I honestly have no idea and I would really recommend considering the ebooks instead! It doesn’t require a Japanese credit card! I know for sure it works with American ones, and hopefully other international ones as well. If you’re interested in helping with translation, I’d recommend getting in contact with the groups currently working on it! Probably you can all work faster together! Good luck and enjoy. :)