In your "Documents" folder, Visual Studio will create a folder named "Visual Studio 2017" or "Visual Studio 2019" (depending on which version is installed). Our SDK was created prior to 2019 so it only puts the template in the 2017 folder. If you have not installed 2017, then this folder will not exist. (so no template)
There could be two reasons you don't see the template.
1) You have (or had) 2017 installed and the template is in the wrong folder for 2019.
a) Then just copy "C:\Users\<userName>\Documents\Visual Studio 2017\Templates\ProjectTemplates\TbcMacros.zip" to the 2019 folder.
2) or you did not have 2017 installed. Then do this....
a) Uninstall "Trimble Macros SDK.msi"
b) Copy the "Visual Studio 2019" folder (and all sub folders) and rename to "Visual Studio 2017"
c) Install the "TrimbleMacros SDK.msi"
d) Then copy the template zip file to the 2019 folder (as in "1" above)