"XXX can't be opened. You should move it to trash." for flash projector applications on mac os sierra
This is actually a macOS Gatekeeper issue try these steps:

To resolute Gatekeeper issues on macOS Sierra you might have to partially or completely disable Gatekeeper checks.

Option I
For a certain application run in Terminal:

sudo xattr -rd com.apple.quarantine /Applications/[LockedApp].app


Option II
To disable checks globally run in Terminal:

sudo spctl --master-disable