Group Policy Administrative Templates missing - ADMX files not found

I downloaded the GPO administrative template installer for WIndows 10.  It installed and I copied the files to \\domain\sysvol\domain\policies\policydefinitions. When I first did this, I saw the policies in Group Policy Mgmt Editor. A day later, I started seeing errors "An appropriate resource file could not be found for file \\<path above>\ActiveXInstallService.admx (error = 3) and then errors on all the other ADMX files pop up too until I stop the task in task mgr. The files look to be all there. Does anyone have insight into this?