: Ensure you have every numbered part of the collection (e.g., part1 through part10) in the same directory.
: Standard game files are often installed via the The Sims 3 Launcher , though "Complete Collection" repacks often use their own dedicated installers.
: A complete collection of The Sims 3 (Base game plus all expansion packs) typically requires between 25 and 30 GB of storage space.
: Right-click on part1.rar and select "Extract Here" using a tool like WinRAR or 7-Zip . The software will automatically pull data from part5.rar and all other segments to recreate the full installer.
The file The.Sims.3.The.Complete.Collection.part5.rar is typically one segment of a multi-part compressed archive containing and its various expansion and stuff packs. Because it is a split archive, you cannot open or extract this specific file on its own; it requires all other parts (part1, part2, etc.) to be present in the same folder to function. How to Use Multi-Part RAR Files
Adding Downloads To The Sims 3 - Parsimonious Technical Support