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5 mar 2021 · Move CustomWorld.world to C:\Program Files\Electronic Arts\The Sims 3\GameData\Shared\NonPackaged\Worlds. You will see SunsetValley.world in the same folder; Move the remaining .package files (if any) to your Mods\Packages folder; Test your game; Replace CustomWorld with the name of your Custom World Optional
For .Sims3Package files, copy/paste the file into your Documents\Electronic Arts\The Sims 3\Downloads folder. Reference Links: Installing Worlds Without the Sims 3 Launcher (near bottom of page)
To install the .world, cut/paste it from where you extracted it, usually into: [installation folder, NOT My Documents] \ Electronic Arts \ The Sims 3 \ GameData \ Shared \ NonPackaged \ Worlds. ^ This is the folder for basegame and custom worlds.
For anyone reading who has TS3 installed through EA Games, here's the updated routing for the Worlds folder on Windows: Local Disk (C:) (or whichever storage you downloaded TS3 onto) > Program Files > EA Games > The Sims 3 > GameData > Shared > NonPackaged > Worlds
You can't install worlds by turning them to package, that's not how it works. You should delete your cache files in 'Documents\Electronic Arts\The Sims 3', and try to use the launcher again. Very odd because I only use the launcher to install store worlds and use the alternate method for all CC worlds.
Some mods and custom content need to be extracted with 7zip (https://www.7-zip.org/) or another extracting tool and need to then be placed into (\Documents\Electronic Arts\The Sims 3\Mods\Packages) depending on how you have your mods folder setup to work and show up in game.
As an aside, you can also use this method to install custom content in sims3pack format, such as clothes, objects, makeup, etc. into your game via the Mods folder instead of the launcher. This gives the added benefit of being able to easily find a piece of CC that you want to remove.
