So basically I did buy Undertale on steam.
I removed the steam client so I have just the game and its files itself, and there I had it.
Same with Deltarune, and the Half-Life games.
For the game engine, I had to wait until the administrators were updating their security systems. Once they started updating, some things went unblocked and I used that opening to get the game engine and start making games.
In that same time, I got a virtual computer and went to gmail to make myself a new email, and used that to create a youtube account and discord. Although, I can't use discord because it's really f**king annoying and its security policy is bullshit