I tried both the current ver 7 demo on our site and the current product (7SR1), and in both I could save a template to a different directory and then later use it to plot.
To save template, I used the "File->Save Template As" menu item and I chose a new directory. To plot with this template, I selected my data and used the "Plot->Template Library" menu item and I could see and select my saved template.
Can you provide more details if you are still encountering this problem?