@simstressa , if the game was already in your Origin account prior to October 2018, the game is still there and will be available. However, EA made the decision to end the promotional give away which began in 2014/2015 to people who could show they had purchased the game.
EA made the decision to utilize their resources and money on other projects and is very aware of the fan support and requests for making a digital version either remastered or available for Windows OS.
There are thousands of posts both here and on the Official Sims Forums asking this very same question. But the bottom line is the following:
1) At this time and for the foreseeable future, EA has made the decision to not make Sims 2 Ultimate Collection available for free or for purchase on Origin.
2) They have no plans to remaster the game.
3) The game is available for purchase on Amazon, E-Bay, your local game stores that sells used copies of the game or Goodwill/Salvation Army stores.
4) If you purchase a used copy of the game, if possible, check the quality of the disk. The codes can be reused to install the game.