The issue is, APO runs a plug-in as a "Windows service", so the plug-in cannot read the authorization information as it works under another "system user". But a solution is available: copy the folder (and all its files) which corresponds to the plug-in, from the "%APPDATA%/Voxengo/Audio Plug-Ins/" folder, to the folder where the plugin DLL is located. For example, "%APPDATA%\Voxengo\Audio Plug-Ins\SPAN Plus\" folder to "C:\Program Files\Common Files\VST2\SPAN Plus\" folder (assuming the "SPAN Plus.dll" is located in the "C:\Program Files\Common Files\VST2\" folder).
The issue is, APO runs a plug-in as a "Windows service", so the plug-in cannot read the authorization information as it works under another "system user".
But a solution is available: copy the folder (and all its files) which corresponds to the plug-in, from the "%APPDATA%/Voxengo/Audio Plug-Ins/" folder, to the folder where the plugin DLL is located. For example,
"%APPDATA%\Voxengo\Audio Plug-Ins\SPAN Plus\" folder to
"C:\Program Files\Common Files\VST2\SPAN Plus\" folder
(assuming the "SPAN Plus.dll" is located in the "C:\Program Files\Common Files\VST2\" folder).