I am trying to install Twixtor 4.5.8 - it is a new install on my new MBP. Enter the name and serial number only to be told that it can't find version 3. Download version 3 and enter the name and serial. Tells me it can't find version 2. Version 2 is a Mac OS9 plugin only. PLEASE MAKE IT EASY FOR LEGITIMATE CUSTOMERS TO USE YOUR PRODUCT - an extra box to put in your upgrade serial would stop this kind of silliness.