Hello Ralph,
Thanks for reaching out.
> Do I have to have a special version of the plugin to shift to pro?
You must install the Pro version of the plugin first in order to use the WPFactory Helper plugin for automatic updates. You can download the Pro version from here. Please log into the website first before using the link.
After installing the plugin, please navigate to Dashboard > Settings > WPFactory. The Email Verification for WooCommerce Pro plugin should be listed there. Then, click on Actions > Set Key, and paste the key into the text field. After that, you should start receiving automatic updates.
I hope you found this information beneficial. If you have any other questions or need assistance, please contact me.
Kind regards,
Moshtafizur