I have found update 10's Description:
This update has a title, and I think you can guess what's in it!
MUSIC - Kevin Macleod
The first video (How to use the Dalek Mod api) is not missing. The second one is also not missing because its still exist on the Swdteam Youtube channel.
Even tho the videos aren’t missing, I think John will still be happy for you trying to help.
EDIT: you can check here to see what videos are missing.
I can only find the deception of the snowman update/update 4
The Snowmen were first seen in the Doctor Who episode 'The Snowmen' (UDWF1's Favourite Episode). They were made of telepathic snow, powered by the Great Intelligence.
The Snowmen will spawn in Snow and Tagia biomes. They used to spawn in all biomes. Currently they have no purpose and just stay still and knock the player back when colliding, but soon they will be able to duplicate themselves around the player and breathe a snow particle effect to attack
Hello, I'm a french boy who want to help you to find the missing advent calendar. I just saw this old video https://www.youtube.com/watch?v=nsrakXtaH7c and i saw you were searching the 2013 advent calendar too (except day 19), i found some videos i think they are in the 2013 advent calendar:
Day 1 and 2 (together):
There is also a french youtuber who made videos of the 2013 advent calendar:
Day 13 (Tenth Planet Cybermen):
Day 14 (Ood):
Day 15 (obsidian dalek):
Day 16 (Sixth Doctor's coat):
Day 17 (Wooden cybermen):
Day 18 (Sky fish):
I hope it will help you ^^
bye bye :)