Dishita seems to work constantly on this extension, in order to keep up with the changes YouTube keep adding to try and prevent downloading. YouTube makes a change, seems it's less than a day before he's figured it out and you're downloading again. I highly recommend going with the upgrade for the higher resolutions. Well worth say, a $30 donation/gift for a year to help him out. NOTE: Dishita is very responsive to support requests and problem reports. He's putting a LOT into this.