@kentb Since it is a non-Opera website I can't vouch for the security of any files there, but https://www.kyleabaker.com/goodies/opera/download-old-opera-versions/ claims to have versions as far back as 2.0. I remember running Opera 3.51 on my old Windows 98 laptop, though as you're talking about 20+ year old software I can't imagine any site still supporting it.