We know it's not there. Unfortunately, it simply doesn't exist anymore.
I reported this as an issue and their solution was to... rename tagify.min.js to tagify.js and include a source map...
But I didn't get time to circle back around to that. It will be resolved when we next update the library, but debugging will require the map file and there won't be an unminified source unless you build it yourself from the source (we're not going to do this).