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Steps to successfully install and register your plug-in on a MacOS device.
Steps to successfully install and register your plug-in on any Windows PC.
To resolve this, you should download the latest version of the plug-in. If the latest version of the plug-in does not apply to your particular working environment, you can toggle the "Always load this plug-in" checkbox and click "Load Plug-in", and this will allow FileMaker to load the plug-in despite being an unsigned plug-in or having an expired certificate.