@sophia_valentina Okay, I checked into the problem, and it appears that Tumblr deleted LittleMsSam's account for some unknown reason. Tumblr is known for doing unintelligent things like this to people. People are usually able to get their accounts restored eventually.
In the meantime, you can get all the links to her files on her patreon page (free with no membership) where she has pasted links to google drive and drop box. You just won't have access to the detailed descriptions or instructions.
https://www.patreon.com/LittleMsSam