A material library should never require an installation wizard. If a download asks you to run an executable file, cancel it immediately.
: While high-detail materials (like "Fine-detail Nature") look stunning, they are "heavy" and can slow down performance on mid-range hardware if used excessively. Where to Find Free Materials Lumion 8.5 Material Library Free Download
Once you've clicked on the link, you'll be taken to a page where you can download the library. Please note that the download is in a zip file format and is approximately 2.5 GB in size. A material library should never require an installation