You need to do this before downloading

The problemgatekeeper_icon

OS X has a new security feature called Gatekeeper. Gatekeeper is enabled by default and prevents applications distributed outside of the Mac App Store from launching.

Launching such application results in the error:
<Application> is damaged and can’t be opened. You should move it to the Trash.

The workaround
You need to do this or your downloaded timer will not work:

  • Open Gatekeeper settings located in “System Preferences > Security & Privacy”.
  • Set “Allow applications downloaded from:” to “Anywhere” and confirm by pressing “Allow From Anywhere”.
  • Download, unpack and run the application.
  • Once application is successfully launched, it no longer goes through Gatekeeper. Thus you can restore Gatekeeper settings to the default option “Mac App Store and identified developers” after successfully launching the application.