The original license terms never specified an end and the need of an "extension" or renewal when I bought this software in 97.
Like any other software company that have done similar things with free / lifetime software, he could have just dropped support for the original branded mIRC client, respun it into another program with most of the code base, add a few entirely useless features (maybe you can slap other people in channels with things other than large trouts!) and sell it under his new license model. He's still branding and selling it as mIRC. That's problematic.