This article was originally written in 2014. Depending on the version of Liquid Rhythm or Liquid Music being installed, and depending on the operating system being installed on, this article may still be of relevance, though possibly with different system UI than those in the screenshots included below.
Liquid Music 1.8.0 + Liquid Rhythm 1.8.0 are notarized by Apple and will not encounter this issue, and are compatible from macOS 10.12 Sierra and up. You are more likely to encounter this issue with older versions of Liquid Music and particularly with older versions of Liquid Rhythm, especially on newer machines.
Circa Liquid Rhythm 1.4.0, some users have encountered a Mac security issue when attempting to mount the Liquid Rhythm .dmg file. The message reads: Liquid Rhythm is damaged and can’t be opened. You should move it to the Trash.
This turned out to be because of new (at-the-time) security features of Gatekeeper. Newer versions of Liquid Rhythm no longer suffer from this issue, but depending on the version you are installing, if you encounter this issue you will require the following solution:
1) Open Preferences and go into your Security app.
2) In the General tab, there will be an area at the bottom that will say “Allow applications downloaded from” (see photo below)
3) Click on the lock icon to unlock this area.
4) Click on Anywhere. Click on the lock symbol to lock.
5) Launch Liquid Rhythm and make sure the connection goes through.
6) Go back to preferences and change the setting back to what it was prior and click on the lock.
7) The next time you launch Liquid Rhythm, it should remember that it was launched previously and it should not bring up the “Damaged” dialog box.
More information from Apple regarding Gatekeeper can be found here.
Another option is to install the base application and not installing the plugins via using the plugin installer. Instead run the standalone and install the plugins with the popup window under the Help Menu.