While Planetside Software has moved on to Terragen 4, they often keep an archive of older versions available.
While Terragen Classic is freeware, tracking down a reliable and safe download requires a bit of care, as the original developer no longer officially supports or hosts the software. The final freely available version is version . terragen classic download free
You don't need a high-end GPU to render stunning scenes. It runs perfectly on cheap laptops. While Planetside Software has moved on to Terragen
Windows 95, 98, ME, 2000, XP, or Mac OS 9.0 to 10.4. Memory: 32 MB of free RAM. Graphics: 3D accelerated GPU supporting basic OpenGL. Running on Modern Windows 10 & 11 You don't need a high-end GPU to render stunning scenes
If the official site completely redirects to Terragen 4, you can find verified, clean copies of Terragen v0.9.43 (the final classic build) on well-known software preservation archives, such as: The Internet Archive (Archive.org) MajorGeeks