"Error During Startup. Please see Log for more details" Problem after installing the Sims 3 Pets

I have the original version of:

The Sims 3
As well as the following expansion Packs;
-Ambitions.
-Outdoor Living Stuff.
-World Adventures.

However, I downloaded the Sims 3 Pets from this website, followed all the instructions in the guide, the problem appeared when it was time to copy the crack. I tried doing so but it gave me a pop up saying i do not have the permissions to make changes to the folders, the "TS3W" was able to be copied, but the problem i mentioned came when i tried to copy the "TSL Host"

Now when I start the Launcher the following pop up appears;

"Error During Startup. Please see Log for more details"

I tried changing the permissions on the games to "Full Aaccess" and tried Uninstalling the Sims 3 Pets, but the problem is still there.

Any Suggestions?

Admin edit: Topic moved to right section.

- ADMIN