A YouTuber called ‘Mecha Salesman’ has done a 4K upscale of Editdroid’s Holiday Special release:-
https://www.youtube.com/watch?v=UB86vy30HUY
More information, including on how to obtain the 4K file, can be found in the above video description text 😃
Super Cookie 64 has done a 1080p version of the above 4K project, and made a thread about it here:-
Mecha Salesman’s 4K upscale of The Holiday Special (EditDroid release) - in 1080p