Here is a custom action that allows you to use RegAsm.exe to register a .Net assembly for Com interop during an update.  A built custom action assembly as well as source code is provided in the attached downloadable zip file.

To use this action:

1.  Place the assembly that you wish to register on the client system using a File Action.

2.  Use the Set Shared Property action and add a variable to the folder that you placed the assembly in step 1.  This is most often the ApplicationDirectory.

3.  Add the RegAsm Custom Action assembly to your project from the Tools/Custom Actions menu.  Once added, you will have a RegAsm Action in your actions palette.

3.  Add a RegAsm Action to your update project and set the RegAsm Command Line and Rollback RegAsm Command Line properties. Here, you will use the shared property value as part of the path to your assembly you are registering.

The output of the regasm is written to the update log after it has been executed.  You can verify its operation there.

This action does require administrative privileges because RegAsm.exe requires privileges.  If you are using the AppLife Update Windows service, you should have no issues with permissions.

File Attachment(s):

RegAsm Update Action.zip (11kb) downloaded 28 time(s).

Kjs.AppLife.Update.Engine.UI111108090431.log (2kb) downloaded 19 time(s).

brianh attached the following image(s):