Not everyone likes to upgrade.
That may be so, and as I said, it is ultimately their choice. However, there is a difference between not wanting to upgrade from 6.03 to 6.16, and not upgrading from 5.61 to 6.16 - it's almost 5 years old. Whether it's mIRC or another program or OS, using something which is 5 years old is not a good idea, especially when there have been 17 new releases of a particular program since the version in question!
Regards,
