I've been trying to get a straight answer on how to fix this problem from both EA Support and G2A Support Hub but they've been sending me in circles, not helping me AT ALL. Seasons is the only one that is showing up. But they all said that they were installed in Origin. I bought them in February and about eight days after, Pets and Generations weren't showing up on my launcher. I purchased the Sims 3 base game, Pets, Generations, Seasons and Ambitions through a platform called G2A. Okay, so I've been having this problem for going on a month now.

Welcome mysterious visitors: New weather patterns aren't the only things appearing in the sky! Befriend an alien visitor and use their UFO to abduct a neighbor, invade a community lot, or travel to the stars.(I've given attachments just in case you need them).

Dress for the weather: Outfit your Sim in new styles for the season, including snow gear, raincoats and umbrellas, and new Halloween costumes!.

Get a tanning booth in time for summer, or ring in the holiday spirit with house lights and decorations. There are a host of new items to ring in each season.

Bring the outdoors inside: Your Sim can now learn the recipe for pumpkin pie or style their home with new furniture and décor.Experience the joy and challenge of changing weather: New weather effects and Sim reactions capture the power and beauty of nature! Sims can get a tan, be struck by lightning, or catch a cold!.Join the fun with seasonal festivals: Sims can get in a snowball fight at the annual winter festival, get their faces painted at the summer festival, whoop it up at the spring dance, or bob for apples during the fall festival.Delight your S ims with new activities for every season: Whether building an intimate igloo, carving a scary Jack o' lantern, taking a plunge off the diving board, or setting off all-new fireworks, your Sim can always find new things to do throughout the year.With new foods, décor and weather effects, your Sims can enjoy the bounty and beauty of the ever-changing seasons and play with life like never before! Features Dress for the weather with seasonal fashions from raincoats to snow gear. Your Sims can pucker up at the kissing booth at the spring festival, or see what Halloween surprises await in the haunted house. All-new activities, like soccer, and big seasonal festivals and celebrations bring the spirit of each season to life. Let your Sims swim in the ocean on a hot summer day, bob for apples in the autumn leaves, test their snowboarding skill on the half pipe, or welcome spring showers with a walk in the rain and a colourful umbrella.

Sims 3 seasons origin