To download the other ones you need to make a folder in the versions folder for minecraft and put the client and JSON file for the versions in there. They all need to be named the same aside from file extensions. Once you do that, you will be able to choose that version when making a new profile with the minecraft launcher.
if this is for a map your best bet would be to set invisible named armor stands and set the command to execute on them there's no way in vanilla minecraft to set an execute command for a normal block with out doing some pretty rough scoreboard coding
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