When a plugin for Rhino is installed on a computer, by default Rhino will load that plugin each time Rhino is started. This is usually convenient, unless for some reason you don't want the plugin to load. This may be because you have a network license and don't want to consume a license so that it will be available for another user in your office. If the first user in the morning starts Rhino and loads Orca3D, it won’t be available to any other users until that first user closes Rhino. So you want everyone to be sure that they only load Orca3D if they need to use it. Other reasons to use plugin load protection are conflicts between different plugins, or switching between the released version of Orca3D and the work-in-progress (WIP) version.

The preferred solution is to use Rhino's plugin load protection mechanism. The steps are as follows for each client machine on which Orca3D is installed. If you decide that you do need Orca3D, you need to close Rhino and re-start it.

1. Run the Rhino PlugInManager command
2. In the resulting form, scroll through the list of plug-ins until you find Orca3D in the list
3. Uncheck the "Enabled" checkbox for Orca3D as shown below
4. Make sure the checkbox "Ask to load disabled plug-ins" is checked as shown below
5. Each time Rhino is started, the user will be asked if they want to load Orca3D. If the user does not want to load Orca3D  they should select "No." In the case of a network license, this will leave the license available for others. 
6. In the case of the WIP, you can then use the plugin manager to manually load the version of Orca3D that you want to use. Run the PlugInManager command, click Install, navigate to the installation folder (e.g., C:\ProgramFiles\Orca3DV3), select Orca3D.rhp, and click Open.

Let us know if you have any questions about this process, and thank you for using Orca3D.