UNA is the best; upgrading not so much. I'm not an expert so I don't know what the solution is, but in my opinion, the upgrade should not rely on a cron job, and maybe it needs to somehow ensure that caches are automatically emptied? I'm not sure. All I know is, I had to change my cron job settings, and even then, the upgrade only partially completed. I had to click upgrade one more time, and now the upgrade seems to have successfully completed. (I hope.)
If someone with little to no web dev skills tries using and upgrading UNA, you're going to get a ton of questions here. Some people may not know how to fix their cron job settings. Luckily, I knew how.
A UNA upgrade, should be like a Wordpress upgrade. You click upgrade and it just works for pretty much any set up.
Just a suggestion. I'm not trying to be rude or ungrateful for anything like that. I still LOVE UNA! But, focus on the upgrade functionality.