If anybody else runs into this and installing the SDK or latest .NET Core doesn't work for you, I fixed it by downloading the latest Launchbox version and re-installing it into the same directory as my existing Launchbox installation. I was then able to run Launchbox and Bigbox and none of my settings changed.
.NET Core problems.
in Troubleshooting
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If anybody else runs into this and installing the SDK or latest .NET Core doesn't work for you, I fixed it by downloading the latest Launchbox version and re-installing it into the same directory as my existing Launchbox installation. I was then able to run Launchbox and Bigbox and none of my settings changed.