If you specifically want to play older versions for speedrunning or nostalgia, some community forums and "Steam manifests" allow owners of the game to legally downgrade their Steam version to the 2016 build.
Including better car tuning, more jobs, and a more stable world. my summer car 2016 version download free repack
"Free" files often come with hidden installers that can harm your computer. If you specifically want to play older versions
You won't be able to use the Steam Workshop for easy modding, which is a huge part of the My Summer Car community. The Better Way to Play my summer car 2016 version download free repack