Sims 2 Pets Won't Install

@CeliaEquus Are you on Windows 10? If you are you may be running into some SecuROM issues and the only way around that would be a digital download.

In that case, please reach out to an Advisor via chat or phone call and they should be able to help:

1. Click on the following link: https://help.ea.com/en/contact-us/ (once there make sure that your country is correctly selected in top left hand corner of Help.EA.com)
2. Find the affected game (if it's an account issue select Origin) and select Next
3. Select your platform and then 'Next' 
4. Select topic from the drop down menus, type in a short description of your issue and select 'Next'.
5. Select a contact option. Please note that available contact options do depend on your country settings and time of day.

Let us know if you run into any issues with this!

No, I'm on Windows 8.1.  I got my new laptop before Windows 10 devices came out, and I've heard too many stories about people upgrading to Windows 10, encountering major problems, and not being able to return to their previous OS.  I've tried tutorials, watching them on Youtube or following steps listed on this site.  Nothing has worked.  The further I've gotten was that error message, and when I looked it up on Google people were saying that if you get that error message, basically nothing can be done.  There's no patch or anything, and The Sims 2 website was taken down, so we just don't seem to get any support nowadays.

@CeliaEquus Please do reach out to an Advisor following the steps I posted above. They can check what exactly can be done.

Thanks!

That's what led me to the forums in the first place.  It was taking too long to wait for someone, and I wasn't sure whether I'd be notified when I was connected to an advisor.  I'll try it again, but it's a ridiculous amount of rigmarole just to get a straight answer.

Just tried it again, and the only two options available were the forums (the recommended option), and by phone (the other option).  I've checked the forums again for this particular error message and people are saying that due to compatibility issues the program won't install.  Since my mother bought this game for me years ago, I probably can't get a refund, and I'd rather play the game.  I don't know why 'Sims 2' works, but this expansion pack doesn't.  I hope it's not a case of installing other expansion packs before it, because I don't have any others.