Step 1:
Copy your current settings such as your subject and email content and save them to a text file.
Step 2:
Check the housekeeping option inside the Maintenance section of the plugin:
This will delete all the plugin settings and delete it’s MySQL tables on uninstall.
Step 3:
Deactivate and delete v1.4.1 of WCDPUE.
Step 4:
Install v2.0.0 and configure your settings!