Not exactly the whole story.... Yes, do not have your computer connected to the internet when you launch Sims 2. That part is true. The part being left out is this.... DO NOT ALLOW ORIGIN TO INSTALL AND REPLACE THE "EA DOWNLOAD MANAGER" Period. Every time you start your computer it will try to update to Origin and delete the EA download manager. Hit cancell or click NO when the permission box comes up asking if you want to allow Origin or EA to make changes to your computer. Also... i clicked on EA Download Managers properties and its located at Program Files--X86--Electronic Arts--EADM. I suggest you Copy EADM and paste it and its files to another folder somewhere elese on your computer. That way if something happens to the EA Download manager you can restore it to its original role of being necessary to the games operation. I have tried deleting the EA download manager and cannot get the came to run at all....even trying the other methods suggested by others who have posted in this topic. It seems to me that EADM is necessary to the launchers functionality.
Just remember to allways cancell or say no and unplug the internet while starting up the sims 2. I also suggest copying the files associated with the sims 2 as a backup incase you have to reinstall the game.
One final thing...and i am being cynical here. I believe this problem was created by Origin or EA Games...or probably both in order to get people to give up on the Sims 2 and go ahead and buy the new Sims 4. I honestly believe that is the case. I understand Origin recently gave away full copies of Sims2 and all its expansion packs for free. The thing is...what good does that do if you cant get them to run? I think they gave away the downloads for free just so that if anyone accused them of purposely sabotaging the sims 2 in order to sell sims 4....they could respond by saying we have no reason to do that...afterall we were giving sims2 away for free....etc etc etc. Thats the way its looks to me. I've been around for 49 years on this earth...and i have seen how rotten people/companies can be. If i am right...i'll bet you they will delete or modify my post on this subject. Huh, EA/Origin? Did i hit a nerve?