Good Old Games (GOG.com) sells Gas Station Simulator completely DRM-free. When you buy it, you can download an — essentially a legal, safe version of what an ISO provides. You can burn that installer to a disc or USB.
If you own a disc version (rare), you can find "No-CD patches" that replace the .exe file, allowing you to run the game from an ISO mount without the physical disc. This is a gray area but generally accepted for personal backups. DOWNLOAD FILE - GAS STATION SIMULATOR.ISO
Once you have your ISO installed (legally), here’s how to make the game run smoothly: Good Old Games (GOG
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