(Game Build) Validating files and updating to latest version

Hello, i'm wondering if there's a way in unity to validate the files of the locally installed build, and comparing them to the latest version of a build stored on a server, and validating the local files to those on the server. If the files on the server are different to the files on the local system (e.g. different checksums, the file's changed, e.g.) the new files would be downloaded and replace the old files. It's possible to create a patch.txt file that has a list of all changed files, but when you have different versions, etc... you would need to download all of the different files that are changed. I'm looking to do this similarly to how steam's validate game file system works, it scans all of the local files, compares them to files stored on their server, and if they're different, downloads the files from the server. Does anyone know how to achieve this?