Sims 2 Ultimate Collection free from Origin: Won't Run?

[Prismacherry410]

I get a pop up message saying that Sims 2 isn't installed. 

1)  The icon is on my desktop

2)  I checked my programs and it's sure as heck still there!

I don't understand why Sims 2 will simply not run on Origin for me, or even from desktop.  I still have all the files I did from then when I downloaded it?!

[Henalexandre]

Have you try to reinstall the game ? Or repair it from Origin ?