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I don’t think that Toon Boom Studio is still available to purchase. The product was retired five or six years ago.
I think the closest thing to Toon Boom Studio would be Toon Boom Harmony Essentials.
In terms of what you want to do (practice animating using classic characters like Bugs Bunny) , I think any animation program with decent drawing tools would allow you to do that . If you can draw Bugs Bunny, then you can learn to animate the character in Harmony , or what have you . Harmony won’t necessarily be better or worse for animating that style of character , because it all depends on your drawing ability to draw the character on-model, and understanding how to apply the classic principles of hand drawn animation.