Update to 1.6 BuddyPress Activity Plus

BuddyPress Activity Plus was listed under available plugin updates. I updated the plugin as I normally do through the automated update, but after the update is attempted, the checkbox to select the plugin to update is gone, but the plugin is still listed as needing an update:

You have version 1.5 installed. Update to 1.6. View version 1.6 details.