If you want to use a calculation or combine multiple fields you can use formulas, to do so select a pdf field, and in the “Mapped To” section select Formula
Adding fields to a formula
To add a field in your formula click on “Add tag to formula” and select the field that ...
To install the full version please do the following:
1.- Download the full version of the plugin. You can find your download link in the receipt that you received after purchasing or you can log into your account and get the license from there https://pdfimporter.rednao.com/checkout/purchase-history/
2.- (Optional) if you have the free version of the plugin, make sure you deactivate it before installing the full version.
3.- Go to your WordPress dashboard and click in Plugins/Add New