I installed Rhino 4 SR6 from my original CD and it loads and runs on my Windows 11 system. “Check for updates” works and says I should download SR8 but the download link does not work. How/where can I download Rhino 4 SR9?
Rhino 4 was the first version of Rhino I used. I currently use Rhino 5, Rhino 6, Rhino 7 and Rhino 8 installed so decided to install Rhino 4 also. The primary reason for installing Rhino 4 is occassionally I’m interested in the history of commands and similar.
Rhino 4 is not supported on anything past Windows 7(32-bit).
It is downloadable, but not even sure it will install or run. https://www.rhino3d.com/download/rhino/4/commercial
Well, if Rhino 1.0 will run on my Windows 10 and 11 machines, I’m sure it’s possible to get V4 running…
Unfortunately I seem to have lost my V4 NFR license key. I have 1.0, 1.1, 2, 3, 5 Win/Mac, 6, 7 and 8… but not 4. 
Rhino 4 installed and opens on my system running Microsoft Windows 11 Home Version 10.0.22631 Build 22631.
More details:
https://wiki.mcneel.com/rhino/legacy_v4
The information in that link appears to be not entirely applicable to Rhino 4 under Windows 11.
Rhino 4 does not appear to be running in compatibility mode. Changes to toolbars and settings are saved.
The current display resolution is 3840 x 2160 with 150% scale. These are the same settings I use with later versions of Rhino including Rhino 8. The icons are smaller than in Rhino 8 but are legible. The layer panel is populated (not blank).
