lektor: Problem installing Lektor v2.0 dmg

I’ve downloaded the dmg from the lektor website and tried the following:

1. Open Finder and navigate to Downloads
2. Open OS X Console, clear it and insert marker
3. Double-click Lektor.dmg
4. Drag to Applications (progress bar appears, no errors)
5. Open Applications in Finder
6. Double-click Lektor.app
7. OS X errors appears saying “Lektor.app” is damaged and can’t be opened. You should move it to the Trash.

Console shows the following log messages right after the marker.

11/04/16 16:42:16,148 CoreServicesUIAgent[353]: Error -60005 creating authorization
11/04/16 16:42:18,382 diskimages-helper[1004]: *** -[NSMachPort handlePortMessage:]: dropping incoming DO message because the connection is invalid
11/04/16 16:42:23,334 lsd[235]: LaunchServices: Could not store lsd-identifiers file at /private/var/db/lsd/com.apple.lsdschemes.plist
11/04/16 16:42:27,297 lsd[235]: LaunchServices: Could not store lsd-identifiers file at /private/var/db/lsd/com.apple.lsdschemes.plist
11/04/16 16:42:27,326 CoreServicesUIAgent[353]: Error -60005 creating authorization
11/04/16 16:42:29,133 CoreServicesUIAgent[353]: Error SecAssessmentCreate: The operation couldn’t be completed. (OSStatus error -67061.)
11/04/16 16:42:32,947 com.apple.xpc.launchd[1]: (com.apple.xpc.launchd.oneshot.0x1000001b.Electron[1006]) Service exited due to signal: Killed: 9
11/04/16 16:42:32,953 lsd[235]: LaunchServices: Could not store lsd-identifiers file at /private/var/db/lsd/com.apple.lsdschemes.plist
11/04/16 16:42:32,978 lsd[235]: LaunchServices: Could not store lsd-identifiers file at /private/var/db/lsd/com.apple.lsdschemes.plist