lol, yes, you can't perfectly physically change hard properties of a movie. Whilst you can sample and filter frequencies of the picture, it would be near impossible to get anything to fix pixelation, especially when it is introduced purposely as a filter.
The nearest you can get is apply a blur filter (a frequency excluding one) which will get rid of the sharp borders between the pixelated blurred patch, and then a sharpen one to make the features more distinct, but it will probably just make it worse.
The 'download an uncensored' one is the only valid option
