The advice to check the Releases View is what fixed it for me. Media->Releases in the left pane, then under Releases->Build Setup there are a number of entries in my project. Debug Setup, Release Setup, Debug MSI, and Release MSI. Click on each one of those, then click the "Setup.exe" tab. The second-to-last entry is "InstallShield Prerequisites Location". I set this to "Follow Individual Selections", as my installer also required "Microsoft .Net Framework 4.6.1 Web" in addition to the NPCAP installer. (Make sure the .Net Framework 4.6.1 Web prerequesite needs to be set to "Download From The Web" in Application Data->Redistributables after changing the value in setup.exe, or you may get a different compilation error) Charles.
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