There are ppl who for various reasons want to use an older version of mIRC, and in some cases HAVE to.

There is no valid reason as to why someone needs to hang on to an old version. "My script doesn't work in the new version" is hardly a valid reason is it?

As I pointed out on my website today, even Khaled recommends that mIRC users upgrade to his new version:

We really recommend you to download and try mIRC v6.03!

That message has come up for every version since V5.4 at least.