It was a "Happy New Year" update following the game's major December 16, 2021, expansion that added an in-game Steam Workshop for mod support, a City map , and a Day/Night cycle .
It is often referenced in Steam Community discussions by players attempting to troubleshoot mod compatibility or revert from beta versions back to a stable build. Security Warning File: Fireworks.Mania.v2021.12.7.zip ...
Compressed zip files from unofficial sources (often labeled with version numbers like "v2021.12.7") frequently contain malware or unwanted software. It is strongly recommended to use official launchers to ensure the safety of your data. OUT NOW: Workshop, day/night, City map and more - SteamDB It was a "Happy New Year" update following
If you found this file on a third-party site or forum rather than through an official platform: It is strongly recommended to use official launchers