Transparent video


I am trying to get a transparent video into a Designer project. I understand that the video needs to be exported as “FLV encoded in VP6 with alpha”. It also states in the Designer help that Adobe Premiere and After Effects CS6 can export this format. It looks like that is no longer the case. It seems (in my Creative Cloud subscription at least), that you are no longer able to download and install CS6 applications. I have also looked at Handbrake but cannot see how to get FLV encoding. Does anyone know of any other ways of getting FLV in VP6 + alpha encoding of videos for use in Designer? Thanks