Just saw this posted on facebook, it's from HotUkdeals and has great feedback on the download.

1. Go to here: https://account.origin.com/cp-...isu&gameId=ebisu
2. Redeem the code “I-LOVE-THE-SIMS”

Full EA Post

Because you’re a passionate The Sims 2 player, we’re making The Sims 2 Ultimate Collection available free of charge to download to your Origin library. To add the game, just follow these steps:
Start by downloading and installing Origin. If you already have Origin you can skip to step 3.
Not an Origin member? Create a free Origin Account to get in the game.
Launch Origin and log into your Origin Account.
From the ‘Games’ tab in the Origin menu, select ‘Redeem Product Code’ and enter the code
I-LOVE-THE-SIMS
If you’re already an Origin member, you can also redeem your code online. Just visit the Origin code redemption page and log in to your Origin Account. Then enter I-LOVE-THE-SIMS in the ‘Product Code’ field.

Log into Origin and download and play the game any time you want .

Thanks for being a passionate The Sims fan, and enjoy your copy of The Sims 2 Ultimate Collection.

This code will available for redemption until July 31st, 2014 at 10AM PDT.

This includes
The Sims 2
University
Nightlife
Christmas Party Pack (US) OR Holiday Party Pack (UK)
Open for Business or Best of Business Collection
Family Fun Stuff
Glamour Life Stuff
Pets
Happy Holiday Stuff
Seasons
Celebration Stuff
H&M Fashion Stuff
Bon Voyage
Teen Style Stuff
FreeTime
Kitchen & Bath Interior Design Stuff
IKEA Home Stuff
Apartment Life
Mansion & Garden Stuff
- connbob

*For those getting confused- once you have logged in/registered and redeemed the code you need to download and install the Origin Client, then log into it. On the tab marked "My Games" you will be able to download the game. - Holly1985

if it keeps rejecting the pre filled registration code do the following 

https://help.ea.com/en/contact...igin&platform=pc it should ask you to give a brief explanation then point you to live chat orted go to live chat here login needed here be prepared for a long wait


once you've explained the problem keep insisting that the code is not working there will issue you with a new code boot up the cliient click play delete the old code then paste then new one

I'm just trying the download now so I will let you know if I have any success.  If it works then it's £400 worth of free game play