You need to have WebForms Pro 3 installed prior to this add-on installation.
Copy app folder from the zip archive to your Magento directory so that it merges with app folder of your site.
For Magento 2.3.5:
For newer Magento versions:
Get the latest version files from your account area My Downloads section.
Copy contents of the zip archive to your Magento directory so that the app folder is merged with the app folder of your site.
Execute console command: