version.jsonand put it in a
bindirectory in your modpack ZIP.
version.jsonwill be the only file in bin/. If other guides tell you to add additional files to bin/, you're probably safe to just ignore that part and keep going.
PSA Technic's support of 1.13+ profiles is a bit wonky, and we do a workaround to make it work. As such, no guarantees on our side can or will be made about its functioning.