Install macOS LibreOffice update

I just tried the update download but when I went to copy it over to my Applications folder, got error message.

Choose your operating system:
macOS (Intel)
LibreOffice_25.2.1_MacOS_x86-64.dmg (292 MB)

The operation can’t be completed because some items had to be skipped. For each item, choose File > Get Info, make sure “Locked” is deselected, and then check the Sharing & Permissions section. When you are sure the items are unlocked and not designated as Read Only or No Access, try again.

There is only one item, the application itself and I went to Get Info and unlocked it.

This appears to be a recent evolution due to Apple’s reinforced security/Gatekeeper system, which appeared in 15.3.1 ? I noticed something similar, but don’t remember whether it was with LibreOffice or a different piece of non-Apple Store software that I was installing.

For me the message was triggered despite the Gatekeeper setting of allowing 3rd Party software to be installed.