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This can be helpful if you are going to have extended time off the internet. Or if you have an expired eval that you want to run as a viewer. Here's how to add a standalone (Single-Computer) license to Rhino:

If Rhino is already installed and is getting a license from a CloudZoo, you can:

1. In Windows Rhino, go to Tools > Options.(Mac: From the Rhinoceros menu, click Preferences)
2. In the Options dialog, click the Licenses page.
3. Click Change your license key.
4. In the Licensing dialog, enter your license key.
5. In the lower-left, select Options and Use only on this computer, then click Continue.

Rhino will then enter the Rhino key and validate the license online if you have an internet connection.

If Rhino is not licensed:

1. Open Rhino and display the dialog “Rhino needs a license to run.”
2. In the lower-left, select Options and Use only on this computer, then click Continue.
3. Enter your Rhino key.

Rhino will then enter the Rhino key and validate the license online if you have an internet connection.

If Rhino does not open, and allow you to pick a license method, you can reset the license keys manually. Then Rhino will open with the dialog “Rhino needs a license to run.” To reset your Rhino keys:

1. Use your Windows file Explorer and browse to: %appdata%\McNeel\Rhinoceros\6.0\License Manager\Licenses
2. Delete everything in that folder
3. Browse to: %programdata%\McNeel\Rhinoceros\6.0\License Manager\Licenses
4. Delete everything in that folder
5. Start Rhino and login again

On macOS, the license files to delete are:

• /Users/<USER>/Library/Application Support/McNeel/Rhinoceros/x.0/License Manager/Licenses/cloudzoo.json

where x.0 is your Rhino version. For example …/8.0/License Manager/.

The Library folder will likely be hidden, but you can navigate to it using “Go to Folder…” (under the Go menu in the menu bar, or Cmd+Shift+G).