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--- rhino:200 [2025/01/07]
cecile
+++ rhino:200 [2025/11/13] (current)
maryfugier [Rhino 8 won't start with this error]
@@ Line 5: / Line 5: @@
   - Do all the Windows updates
-  - Install Windows .NET Desktop Runtime 7.0.20 x64 “//windowsdesktop-runtime-7.0.20-win-x64.exe//” Download here: https://dotnet.microsoft.com/en-us/download/dotnet/7.0
+  - Reinstall active MS .NET Runtime 8.0.22 or later: https://dotnet.microsoft.com/en-us/download/dotnet/8.0
   - Start Rhino and test
+===== Rhino 8 STILL won't start with this same error =====
+In order for us to diagnose the issue, please follow these steps using Rhino 8.26 or later:
+  - Right click on **Windows Start > Run**
+  - Paste ''C:\Program Files\Rhino 8\System\Rhino.exe /debuglog'' and click "Ok".
+  - Exit Rhino
+  - Navigate to your Documents folder, and send us both the ''RhinoDebugMessages.txt'' and ''RhinoDotNetTraceLog.txt'' files.
+  - Zip and email to //tech@mcneel.com// with a description of your problem. Or submit the Zip using our [[https://www.rhino3d.com/upload|upload tool]].
+===== If all else fails =====
 If Rhino will //still// not open without this error, modify the Rhino shortcut with the /netfx switch.

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