Copy the extracted files from the STEX Collection Vol 1, 2, 3 into the new folder you created.
Once you've downloaded the STEX Collection Vol 1, 2, 3, extract the archive files using a tool like WinRAR or 7-Zip. The archive files will likely be in a .zip or .rar format. stex collection vol 1 2 3 for simcity 4 free install
Create a new folder within your SimCity 4 installation folder, named STEX Collection or STEX Vol 1-3 . This will help keep the custom content organized. Copy the extracted files from the STEX Collection
Restart SimCity 4 or press to refresh the custom content. stex collection vol 1 2 3 for simcity 4 free install