"The Sims 3 is corrupt or not properly installed" when installing Outdoor Living Stuff. [SOLVED]

Griff the Griffin wrote:First off, I would like to thank the administration for helping with whatever happened to my account activation process.

   Now to the problem with Sims 3: so, I downloaded the Complete Collection with the intention of installing all of the EPs and SPs. I carefully read the Installation Guide, installed the base game, used the manual patcher, all as I was instructed to do in the guide, and then proceeded to install the EPs and SPs. While I know it's not necessary,  I decided to install them in release order. All was well until I got to the Outdoor Living Stuff Pack, when I received the following error after opening the installer: "The Sims 3 is corrupt or not properly installed". I tried to install other SPs and EPs, and received the same error from all of them. Then, I decided to manually unninstall the game, following EA's instructions. After that, I reinstalled, but received the same error from the same Pack.
   This seems to be the exact same problem from this topic, where Hexorcist said it was a registry problem. Sadly, there are no instructions there on how to solve it.

   Can anybody help me solve this? I've been really itching to play Sims 3 after being disapointed by Sims 4's lack of Story Progression and Open World some weeks ago.
   Thanks in advance!

Griff the Griffin wrote:Yes, I always use WinRar. Extacted everything normally, didn't receive any error message.

Griff the Griffin wrote:I get the same problem with all packs that were released after Outdoor Living, but I'm going to try to apply the manual patch again.

EDIT: Reapplied the patch but I'm still receiving the same error. Also tried to launch the game after cracking it, and the launcher gave me this message: "There was an error during startup. Please see the log for details".

Griff the Griffin wrote:I DID IT!

I ended up installing the game in another computer, and there it worked fine, so I just copied all the files back to my PC. Got that error with the launcer.
I discovered that quite  a few people had had that error and that it happened because of leftover keys in the Registry. Thing is, when I looked, I had missing keys in the registry, because I hadn't installed all the expansios here. Fortunately, it was as simple as just exporting the keys from that other PC to mine and checking if the paths to the game directory and .exe where the same. After I confirmed that, I opened up the launcher and almost screamed with joy when it opened with no errors.
I still have no clue what the original problem was, though.

Anyway, thank you for your help!

Nice to hear.   But one thing to note for the future: don't uninstall anything under Windows OS, unless you know how to do it properly. The reason you got that error was most likely indeed because something was broken on your first PC, either in the files or the registry.