I've just installed the updated version (apparently successfully) but not without some hand-wringing and a few calls to a more technologically savvy friend.

May I suggest some re-wording of the readme file?
It's very helpful that the download file says "unzip first." But the unzipped file also says "unzip first," and opening that file leads to a number of confusion-inducing files for those of us who aren't as knowledgeable about such things. A simple line that reads, "After unzipping the downloaded file, choose the file that opens as the file to install. Even though the unzipped file still reads "unzip first," it is not necessary to unzip a second time."

I'm very happy to have the latest version installed, and I thank you for your efforts.
Scott