Sorry I thought you didn't find the upgrade script, I was in the middle of editing the downloads page. The upgrade folder is right there in the zip file when you unzip it, is it not?

When you unzip it, there should be a file called readme.txt and a folder called "upgrade", which is what you are meant to upload, along with the main iWiccle 1.20 bundle.

Here is a direct link to the separately provided upgrade script, now also available under the main downloads along with older upgrade scripts for those who need to take a longer route to 1.20. Were you looking for it inside the main iWiccle bundle?