I need more detail on what you are not able to do.
If you are getting an error similar to the image attached, there is a simple fix. This is a problem that has already been fixed in the Beta 2 release coming out this week. A very quick work around is to create the directory it is looking for and place your template in there. Also place it in the equivalent 2019 directory. That will solve your immediate problem and when you get Beta 2 you will already be set.