That License clause is to deter magazine editors, over-eager script kids, and so forth.
Read between the lines.
In between the lines is blank space. I suggest you read the actual lines. On them are words and, unless you're the one who wrote them, you're hardly in a position to say what it is they
really mean.
Bottom line: If someone can't figure out how to write an installer for their script that's user-friendly without breaking the mIRC licence agreement then you know exactly what to expect from the quality of the script too.