If this is for the game , the "paper" you are likely looking for is the digital manual or the changelog for version 4.2.0.

Usually found within the installation folder or on the Steam Store page under "View Manual."

Interactive simulations for emergency services training.

The Greek prefix "Αρχείο:" (Archive) suggests you may have found this on a Greek file-sharing or community forum (like PC-Gr or similar).

"Serious Games in the Training of Disaster Management" often references the mechanics found in this software version for pedagogical analysis. Troubleshooting the "Zip" Source

Version 4.2.0 specifically addressed stability and multiplayer synchronization. Detailed notes are hosted on the World of Emergency official forums. 2. Research and Serious Games