Can someone help, please? I need a Create-a-World for The Sims 3 version 1.0.615.00107 because for some reason I cannot update my game to use the latest one.

Cawster has what you're looking for: SuperCAW EXEs

Edit: Actually linked wrong page: Installers

Okay, thanks very much :D
EDIT: Read the title CORRECTLY next time, silly man. I wanted Create-a-World, not CAW files for EA worlds!! *facepalm*

Those are the install files for CAW based on which game version/patch you have installed.

Edit: Find your patch level (which isn't 1.0.615.00107), and download the corresponding version. Since I doubted myself, I went ahead and downloaded an older version of CAW (1.55/1.54 for Island Paradise) from that site and it downloaded and installed correctly.

Good luck.

@TinandCopper: I will have to ask you to dial down your tone.

You shall correct someone in a nice way, and when you know you're right.

I don't get you all. That WASN'T real anger, so why are you immediately coming at me saying to dial down my tone? Also my post gets 5 dislikes JUST because of that?
If you were to see my REAL anger, it is a hell made from curse words and insults which would get me, sadly, banned.
Also, simb0t: Followed the instructions and I can't find my base game icon. Any solution?

Try following these instructions to find your game version.

I don't think there was any offense meant, nor was any taken.

This is written and lots of communication doesn't transfer.

Well you don't need to curse just for someone to perceive your tone as being angry. Anybody would, of course, assume you were yelling and being rude if you read a newcomer's post like that. Also like Volvenom said, it's hard to understand a person's true meaning behind their writing, so you should be careful on what you write.

But, okay. After reading your post for the 3rd time, I guess you didn't mean to be rude after all.

Yeah I didn't mean to be rude, and if I did i'm sorry. I actually DO have problems with emotions so it's not my fault I can't control them, sorry...