Several people at gpsfiledepot have reported that maps don't install properly using the newest version of Basecamp/MapInstall. Also being discussed on Garmin's support forums

https://forums.garmin.com/forum/mac-windows-software/windows-software/basecamp-aa/1353592-...-with-basecamp-4-7-0

So it's best not to upgrade if you haven't already done so.

They've been talking about multiple issues with 4.7.0 on the Basecamp forum on Garmin's site since it was released a few days ago. I've only looked at the Windows forum so it's not clear to me whether the Apple version has the same issues or not.

Even the forum moderator has been recommending not to update.

...ken...

Don't know... the complaints I've seen are specifically about Windows MapInstall, which creates some kind of corrupt files that aren't recognized on the GPS. The main focus of the update appears to be removing features and complying with GDPR. Here's the Mac version

Changes made from version 4.6.3 to 4.7.0:
Updated BaseCamp to conform to GDPR requirements
Improved MTP device support
Removed online components of Garmin Adventures
Removed Garmin Cloud Drive support
Removed Garmin Connect find and upload
Removed Picassa photo sharing
Improved stability

And the Windows version

Changes made from version 4.6.2 to 4.7.0:
Updated BaseCamp to conform to GDPR requirements
Improved MTP device support
Removed online components of Garmin Adventures
Removed Garmin Cloud Drive support
Removed Garmin Connect find and upload
Removed Picassa photo sharing

They are the same... except the Mac version has "improved stability" and the Windows version does not.