Inappropriate Upgrade Fee

I purchased Camtasia 8.1 a while back. Then I paid $99 to upgrade to version 9 towards the end of 2016. It has been a year and a half and you have Camtasia 2018 and it is already a paid upgrade? So you took my money for 9, removed mp3 format claiming it is obsolete even though countless users including myself wanted it - now a short time later, $99 for another upgrade!! You haven't made enough improvements to warrant a paid upgrade and are really showing your willingness to abuse your paying customers. If I knew version 9 would be so short lived, I would have stuck with 8.1 and have never paid you for 9. Wow, huge slap in the face on your part.