Maybe in the Next version (7) have an auto update system. its like a mini program that auto updates your mirc.exe and files. this would keep every mirc up to date and all mIRC forums would benefit from not having to constantly tell people to update their mIRC to make this script work. It could also mean u dont have to replace the whole mirc.exe, it could simply edit, add and remove things so evyerhint else stays the same.
What i know it's just mirc.exe that are the new version of mirc, and mirc can be installed in your old mirc folder, then it saves your settings from the old install. And i dont know if it's a good idea to "auto" update, as for me, i stay on the old version a while after a new have been relesed, that way i dont have to deal with the "new" bugs that allways comes with a new program/version.