1.Uninstall the old version before installing the new one.

Remove DynamicWebTwain Class at "C:\WINDOWS\Downloaded Program Files" if it exists.

2.Install Dynamic Web TWAIN 7.0.

3.The upgrades of DWT for web applications and desktop applications are different.

1) If you are developing a web application with DWT, please follow the steps below:

• Replace the old CAB/LPK files with the new ones. The CAB file can be found at the installation directory of Dynamic Web TWAIN, and the LPK file can be created using Lpk_tool.exe that can be downloaded from www.microsoft.com. Please click here for information on how to create a LPK file.

• Change the CodeBase. Please click here for more information about how to upgrade DWT on the client side when the upgrade is done on the server side.
  
  <object classid="clsid:FFC6F181-A5CF-4ec4-A441-093D7134FBF2" id="DynamicWebTwain1" width="143" height="156"
  CodeBase = "DynamicWebTWAIN.cab#version=6,3,1">
  
  To:
  
  <object classid="clsid:FFC6F181-A5CF-4ec4-A441-093D7134FBF2" id="DynamicWebTwain1" width="143" height="156"
  CodeBase = "DynamicWebTWAIN.cab#version=7,0">

2) If you are developing a desktop application with DWT, you need to remove the control of the old version from the forms and re-add the control of the 7.0 version. Click here to get more information on how to use DWT in different development environments.