Using ${var} in strings is deprecated

Dear @nauriskolats,

Thanks for the topic.

In order for us to be able to investigate the issue you are facing, we will need the following information.

Please provide us with your:

1. PHP version
2. WordPress version
3. Popup Box plugin version

Looking forward to hearing back from you.

Thank you.

Dear @nauriskolats,

Thanks for the reply.

Please note that you are using an older version of the plugin (7.8.9).
The latest version currently available is 7.9.1.

Please update to the latest version and recheck the issue.

Here is the Update Guide:
https://ays-pro.com/how-to-update-upgrade-ays-pro-plugins

You can make a DB backup before installing the zip file for your safety (you can use UpdraftPlus).

Also, as you are using the Pro version of the plugin, please contact us via this form for premium support. Our customer care specialists will always be happy to help you.
Commercial products are not supported in these forums.

Thank you.