There was a download of Operation Mars 2.0 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions among Operation Mars users are 3.2, 3.1 and 3.0.
The actual developer of the program is FreeGamesWay.com. Commonly, this program's installer has the following filenames: game.exe and Opmars.exe etc.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. You can run this PC software on Windows XP/7/8/10/11 32-bit. The software lies within Games, more precisely Action.
From the developer:
The belligerent aliens from another Galaxy conquered Mars. Free the planet from the invaders. As a pilot of a space ship, join battle to free the population of the planet. Well-equipped detachments of enemies' spaceships stand in your way. Destroy the enemies and free the conquered territories from level to level. Peaceful citizens help you by providing weapons, ammunition, and equipment for the spaceship.
You may want to check out more software, such as Mars Simulation Project, Mars Notebook or Mars WinCleaner, which might be similar to Operation Mars.