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--- rhino:200 [2018/09/04]
+++ rhino:200 [2025/11/13] (current)
maryfugier [Rhino 8 won't start with this error]
@@ Line 1: / Line 1: @@
+====== License manager initialization failed with error -200 ======
+{{:rhino:error-200.png?400|}}\\
+===== Rhino 8 won't start with this error =====
+  - Do all the Windows updates
+  - 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.
+Be sure to add a space before /netfx.
+{{:rhino:rhino_netfx_switch.png?400|}}
+-
+Add this to the Rhino 8 shortcut as show above.
+/netfx initializes .NET framework 4.8.
+Now open Rhino with the short cut.
+For additional help, email Technical support at **tech@mcneel.com**.
+//Include your Rhino System Information: in Rhino type **SystemInfo** command.
+Copy and paste the text results into your reply//
+===== Rhino 6 won't start with this error =====
+**Solution 1:**
+Run a "Repair" on the 64-bit Rhino in Control Panel > Programs and Features to correct the error.
+**Solution 2:**
+If you have ShapeDiver v1.9.1 for Grasshopper installed, run the TestPackageManager command, and update ShapeDiver to v1.92-beta.1 or above. \\
+(ShapeDiver does not cause this error for Rhino 7.)

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