Follow the steps below to upgrade Dynamic Web TWAIN Plug-in Edition from the trial version to the full version:

1. Uninstall the trial version of Dynamic Web TWAIN Plug-in Edition from your machine.

2. Install the full version of Dynamic Web TWAIN Plug-in Edition and input the full Web Server License. For more info, please click here.

3. Replace DynamicWebTwain.xpi or DynamicWebTWAINPlugInTrial.exe on your web server with the full version ones.
The DynamicWebTwain.xpi or DynamicWebTWAINPlugIn.exe file can be found in the installation folder of Dynamic Web TWAIN Plug-in.

Also, before testing your web application in Firefox again, please remove DynamicWebTWAIN Plugin first, which can be found at Firefox menu Tools -> Add-ons->extensions.

And before testing your web application in Chrome, Safari, Opera, etc., please remove the old files DynamicWebTwain.xpt and NPDynamicWebTwain.dll first, which can be found at C:\Windows\SysWOW64\dynamsoft\dynamicwebtwain or C:\Windows\SysWOW64\dynamsoft\dynamicwebtwain on a 64-bit OS.