Given that official sources are gone, the safest method is using archival services like the or reputable open-source software repositories. Here is a step-by-step guide.
Historically, X-Lite 3.0 was a free sibling application based on the eyeBeam 1.5 engine, which may be the source of the "3.0" versioning confusion. Critical Security Warning Eyebeam 3.0 Download