Verify Hash's after installing

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Have the script look into the files and take theres hash then have them see if it matchs up with the online versions if they do then the install is like good alright next download or command on the installer but if the local file has a differnt hash then the server then have it redownload the file if it still is not the same redownload the file three more times and ech time check it if the hashes still don't match then ask the user if they want to keep redownloading or use that file anyway and just ignore the hash.