: The standard Steam installation for OMSI 2 is approximately 4.10 GB. Minimum storage requirements listed on retail sites range from 3.7 GB to 5 GB .

: Official Steam games are not typically distributed as .zip files from third-party sources. Using such files may risk malware or account issues. For safety and stability, it is recommended to Verify Game Files directly through the Steam Client . Common Large Add-ons (Examples) Add-on Name Approx. Size London Busbetrieb-Simulator Bremen-Nord Metropole Ruhr

The file with a size of 21.81 GB is significantly larger than the official base game download, which typically requires roughly 4.10 GB of space . A file of this size likely includes numerous community mods or commercial DLCs, which can rapidly increase the installation footprint. Key Observations

If you are trying to install this, ensure you have sufficient hard drive space and consider using the 4GB Patch , which is often required to run large maps without memory errors. Steam DLC Page: OMSI 2

: OMSI 2 has a vast library of add-ons. For instance, the London DLC alone is roughly 9.60 GB . A 21.81 GB archive suggests a "bundled" version containing multiple maps (like Chicago, Hamburg, or Gladbeck) and vehicle packs.