Hi Brett,
I believe you are getting the C1083 errors because your environment does not know where google test is installed. Please try:
1. Close Visual Studio (environment variable re-definitions don't get picked up by Visual Studio unless you restart it)
2. Ensure your "GTEST" environment variable points to the folder containing the Google Test "README.md" file. For instance, on my computer, it is: "C:\Projects\googletest\googletest\".
You can set an environment variable in a command prompt by typing: SETX GTEST C:\path\to\googletest\googletest
You can verify your environment variable value by opening up a command prompt and typing: echo %GTEST%
3. Reopen Visual Studio, try and build again.
Please let us know if that doesn't work, hopefully that helps.
Best,
Nick