(Note: This requires a free Simtropolis account to download. It is the safest and most archived source for the file.)
October 26, 2023 Subject: Availability and Analysis of the SimCity 4 Deluxe Edition v1.1.640 Patch simcity 4 deluxe edition v11640 patch link
: If you purchased the game on Steam or GOG , your version is likely already v1.1.641, which includes all the fixes of 1.1.640 and does not require manual patching. (Note: This requires a free Simtropolis account to download
Since the original Maxis site is long gone, the community has preserved these essential files on veteran fan sites: your version is likely already v1.1.641