What made quite an impression on me back then was the fact that the scripting language somewhat resembles assembly. [1] Also, NSIS had/has a tool called "NSIS Dialog Designer" which I used to design the Installer forms.
It was quite the fun experience and I'm pleasantly surprised that NSIS is supported to this day [2].
0 - https://nsis.sourceforge.io/Main_Page
1 - https://nsis.sourceforge.io/Check_whether_your_application_i...