Where do I find Plumsail.Form.SP2019.sppkg when installing

I installed forms and am at the step to add Plumsail.Form.SP2019.sppkg to the App Catalog....where do I get Plumsail.Form.SP2019.sppkg?

Hello @wilbee,

You need to click Design Forms button:

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And you will be redirected on the page where you can download Plumsail.Form.SP2019.sppkg:
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You can find more information about installation of Plumsail Forms for SharePoint 2019 here.