Copy and paste the code above into notepad, than save as a lisp file, ie .lsp.
The multi getvals is demand loaded so it must be in a location that can be found, easiest way is edit this line in the code. Put in where you have saved the file make sure to use "\\" like example it can be a single or multiple directories deep.
(if (not AH:getvalsm)(load "C:\\mydirectory\\where i saved\\Multi Getvals.lsp"))