%ALLUSERSPROFILE%/SAS/JMP/AddIns (any user on this machine can access the add-in)
%APPDATA%/SAS/JMP/AddIns (only the current user on this machine can access the add-in)
/Library/Application Support/JMP/AddIns (any user on this machine can access the add-in)
~/Library/Application Support/JMP/AddIns (only the current user on this machine can access the add-in)
When JMP starts, the addinRegistry.xml file is read, which contains information about previously registered JMP add-ins. Then JMP looks in the add-in folders for any other add-ins and installs them automatically.
Notes: 
The Home Folder for discovered add-ins does not have to be the AddIns subfolder in which the addin.def file was found. The addin.def file can be the only file in that subfolder and have a Home setting that points to some other location where the add-in files actually reside.

Help created on 7/12/2018