Here's the message I get when I try to open a solution containing an InstallShield 2016 Express Setup project in Visual Studio 2017 update 15.3.2:

This version of Visual Studio is unable to open the following projects. The project types may not be installed or this version of Visual Studio may not support them.
For more information on enabling these project types or otherwise migrating your assets, please see the details in the "Migration Report" displayed after clicking OK.
- Setup, "C:\Develop\DxImporter\DesktopWebUiV2\Setup\Setup.isproj"

Here are the details in the "Migration Report":

Setup\Setup.isproj: The application which this project type is based on was not found. Please try this link for further information:

That link only mentions InstallShield once:

This project can't be opened in Visual Studio 2013 because it doesn't support that project type. We recommend that you use InstallShield Limited Edition for Visual Studio (ISLE), a free deployment solution that directly supports most Windows platforms and application runtimes. You can also use ISLE to import data and settings from Visual Studio Installer projects.

This doesn't apply since I'm running VS 2017. By the way, this was not an issue with my previous version of VS 2017 (15.0). Any help is greatly appreciated!