This seems to indicate what many of us here have long suspected, there is no more BaseCamp development:
https://support.garmin.com/en-CA/?faq=cmo7YxRdRB1DDl1JAWuEV8
(Thanks to Boyd at http://forums.gpsreview.net/discussion/31269/is-basecamp-headed-for-extinction#latest for flagging this up, and the folks at GPSFileDepot https://www.gpsfiledepot.com/)