This is the easiest way to make a professional looking repack.
https://www.******************?v=sIC-UtztwVE
But this will compress but not in a ultra level but it will get the job done.
Also if you want ultra shrink it you need to study more about compression programs like FreeARC, 7Zip, Precomp and Srep how to tweak them them to get the best compression also you need to learn how to shrink videos using bink compressor google it you'll find it.