I'm using Bot Framework V4. I would like to know if I need to install any NuGet packages to support Adaptive cards version 1.2
I tested with some video and image content.All are working. Wondering if V4 by default has support for latest adaptive cards version.
The Bot Builder SDK has nothing to do with Adaptive Cards. It's not up to the SDK to support a specific Adaptive Cards version, it's up to whatever application ends up rendering the Adaptive Cards. Even if the SDK did have a dependency on the Adaptive Cards NuGet package, that would be handled automatically and you wouldn't have to install it yourself. You can install the NuGet package for your bot if you'd like to use its C# types to help you manage Adaptive Cards dynamically in your code as an alternative to just using JSON, but that is not necessary.
Please refer to my latest blog post to better understand using Adaptive Cards with the Microsoft Bot Framework.