PeaZip is loaded with advanced features. I often use those myself. Love it :) The downside to this large amount of advanced features is that some pages are heavily cluttered with advanced options. In turn, people not familiar with technologies might be intimidated and confused.
To resolve this challenge, how about adding a toggle button to switch between a Easy and an Advanced interface?
This Easy interface would simply hide the less frequently used advanced features. But when users need advanced features, they could simply use this toggle button. Which is somehow available on all page or trough a new Display menu..
Related to this, when user open PeaZip, they would be presented with this question: Easy or Advanced interface? And an optional checkbox to Remember.