A quick search on YouTube, Reddit (r/gatewaytapes, r/AstralProjection), Internet Archive, or BitTorrent sites will yield hundreds of results claiming to offer "Gateway Hemi-Sync Tapes Free." Here is the breakdown of what you will actually find.
Legitimate free access to the Gateway Experience and Hemi-Sync content is available through specific apps and archives: Gateway Hemi-sync Tapes Free