FluteNinja

My son was trying to upload a pretty simple .video to utube using free version of VideoPad editor. Just one audio stream - he has uploaded simple film reviews videos using the same software many times recently but for some reason for his latest one when he clicks to 'create' export to utube it comes with a VideoPAd editor message saying "Youre trying to upload to a paid format. Do you want to upgrade to enable it?" Which if press OK leads you to an upgrade that costs money, a lot! We dont understand why given his videos are all pretty similar with no fancy stuff, one audio stream etc, have all previously uploaded fine but now seems we must pay for full version? Many thanks and apologies as Im not IT literate its hard to explain, Tried to attach a screenshot but that didn't work either!