Only one season of Zero no Tsukaima (aka. The familiar of Zero) has been dubbed, and that's the first season (the first 13 episodes).
The second season is still being dubbed.
Here is a direct link to all the episodes:
https://www.animefreak.tv/
Episodes 1-13 are dubbed and the rest is subbed, but you could give the sub a chance, it won't kill you. ;)
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