https://next-episode.net/the-avengers
That is the promotional poster (not my physical one obviously, but that’s the style I have.) If you bought all 4 1967 vhs boxsets it was a free mail order poster. I have it framed and proudly displayed. I still can believe those vhs sets were $25 or more! Now today we have glorious HD!
It looks like Amazon might have it on Prime for some parts of the world, but I don't know if that means you can stream it in Argentina that way.
Hope this is of some help
https://www.primevideo.com/detail/0HKDJ1FZVI00KT34PU9VLGUHOJ