By default it installs into /Users/{your username}/.wl2k by default when you install on a Mac. Within that directory, check for (or create) a subdirectory "Standard_Forms" and copy all your forms into that directory. (Download from
https://www.winlink.org/content/how_manually_update_standard_templates_version_10159). To see the hidden directory in the Finder,
Command + Shift + . (full stop/period) - then you can copy the files you downloaded into the template directory.
Also note: You can edit the config.json file directly with Notepad or any other text editor of your choice.
---mark, KM6ZPO