A simple solution may be to add the t&cs to the app code, they can then be displayed on the first run of the application. If the user selects accept, write out a file to the local file system which can be checked for when the app starts. That's how I've done it with clickonce in the past, with some quite substantial applications.
There is also an
API here[
^] one can use to do all kinds of things in the context of clickonce. In fact one should really treat clickonce as purely a deployment mechanism. If extra installation steps need to be taken, they should be included in the application itself.
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