PDF Vouchers plugin activation error


I have downloaded the Easy Digital Downloads - PDF Vouchers, but returns this message:
Easy Digital Downloads needs to be activated to be able to use the PDF Vouchers.

I found this solution: How get a plugin activation code but it didn’t work for me.

When i activate the plugin:

Screenshot_2020-05-29 Plugins ‹ WordPress — WordPress

When i click on setting

How can i proceed?

Best regards

Easy Digital Downloads - PDF Vouchers need to install and active ‘Easy Digital Downloads’ plugins. so, make sure you have install and active ‘Easy Digital Downloads’ plugin before settings the PDF Vouchers plugin.