I see KindleGen v2.9 for Windows XP and Vista, 7, but will this work with Windows 8.1? I'd like to download this to format a picture book for Kindle publication. I had previously sold the PB to a publisher but it is now out of print and I have received my reversion of rights letter. If there is no KindleGen for Windows 8.1 can anyone recommend a good picture book format program that will be attractive to Kindle readers? Thanks a bunch!