Since eForm, version 2.x, if you are upgrading from the Free Version to the Premium one, then both the plugins will work in parallel. However, if you choose to uninstall the free version, here is what you need to do:
- Deactivate and Delete the old Free version from your WordPress Installation.
- Go to WP ADMIN > Plugins > Installed Plugins .
- Find and Deactivate the WP Feedback & Survey Manager Plugin.
- Once deactivated, Delete the plugin.
- Now install the plugin as usual.