Trouble downloading DLCs

I've successfully downloaded all the available DLCs on another computer about a year ago, but now I'm trying to download them on my new computer. The game opened successfully until I downloaded the Parenthood DLC. Now, the game won't open until I click run as administrator 4-5 times. Then, the game crashes as soon as I hit play. I have uninstalled everything downloaded and deleted, then redownloaded the DLCs. Now, I just have the base game installed and it won't open, telling me that the game information is based on a newer version of the Sims and I need to run Origin to update. HELP!!!

I've successfully downloaded all the available DLCs on another computer about a year ago, but now I'm trying to download them on my new computer. The game opened successfully until I downloaded the Parenthood DLC. Now, the game won't open until I click run as administrator 4-5 times. 

It's either caused by mods or you didn't delete/rename the game folder .
The parenthoud game folder in the download is not a complete folder but just the update.
My suggestion is to continue installing with Fitness, 
Before copying the Game folder from the Fitness download, delete the existing folder Game in your install folder.
The copy the folders from Fitness to your install folder.

 Now, I just have the base game installed and it won't open, telling me that the game information is based on a newer version of the Sims and I need to run Origin to update.

Goto the Sims 4 folder in Documents\Electronic Arts
Delete the file GameVersion.txt
Start your game again