Support ended long ago. Newer operating systems (Windows 10/11) cannot run ArcView 3.3 natively. The 16-bit installer components are obsolete. Even if you found an installer, installation would fail unless you use a virtual machine running Windows 98 or Windows 2000.
Operating system: Windows NT 4.0. Processor: Pentium II or higher. Memory: 64 MB RAM or higher. Hard disk space: 100 MB or higher. Install ArcView 3.3 on Windows 10 Arcview Gis 3.3 Portable Free Download-
If you need GIS functionality for free without the headaches of 20-year-old software, consider these modern options: Install ArcView 3.3 on Windows 10 Support ended long ago