Always check the XDA thread for updated links. Do not download ZBuilder 4 from generic “download sites.” Go directly to XDA-Developers → ZUK Z2 (or your model) forum → Guides → ZBuilder thread – that is the only safe and useful path.
Download ZBuilder_v4.x.x.zip (not an .exe directly from unknown sources) zbuilder 4 download
Find the download link – typically to AndroidFileHost or a personal server Always check the XDA thread for updated links