Apple removed TNT’s certificate, so the app will crash after July 12th. The current solution is to sign it yourself.
Run in Terminal
codesign --force --deep --sign - /Applications/name.app
if Permission denied don't forget to add sudo
example:
sudo codesign --force --deep --sign - /Applications/1Password\ 7.app
Requisite: Xcode or the Apple Command Line Tools
To install, execute
xcode-select --install
Some of the advice above looks a bit sketchy, but I have the same problem and I really need Lightroom so I'm here, does anyone have any solutions yet?