I believe that what you are trying to do is somewhat similar to what I tried to do when I first started coding. When I realized that the "on Join" wasn't working for me, then I made this script to serve my purpose.
When I have something new I want to say, then I just type "!update 0.5 I added some stuff.", and the next time someone chats in my channel, it whispers them "Welcome to StreamBot v0.5! Changelog: I added some stuff."
on *:TEXT:!update*:#: {
if ($nick == kuboskube) {
set %Version $$2
set %Changelog $$3-
}
}
on *:TEXT:*:#: {
if (%Version. [ $+ [ $nick ] ] != $null && %Version. [ $+ [ $nick ] ] == %Version) {
goto VersionChecked
}
set %Version. [ $+ [ $nick ] ] %Version
msg $chan /w $nick Welcome to StreamBot v [ $+ [ %Version ] $+ [ ! ] ] Changelog: %ChangeLog
:VersionChecked
}