Get it running.

macOS: Open the .pkg and finish the installer. Reopen your DAW. It installs VST3 and AU.

Windows: Open the .exe and finish the installer. Reopen your DAW. It installs the 64 bit VST3.

Manual Windows install: Unzip the VST3 download and move the full Harmonic Bass Machine.vst3 folder into C:\Program Files\Common Files\VST3. Reopen your DAW and run a full plugin rescan.

Windows may show Unknown publisher while Microsoft finishes approving Unglued. Only continue if you downloaded it from this site. Choose More info, then Run anyway.

FL Studio: Options, File settings, Manage plugins. Turn on Verify plugins and Rescan previously verified plugins, then press Find installed plugins.

Logic Pro: Settings, Plug-In Manager. Select Harmonic Bass Machine, then Reset and Rescan Selection.

Anything else: Restart the DAW and run its full VST3 or Audio Unit rescan.

Open the plugin and click ACTIVATE at the bottom left. Sign in with the email you bought it with, then choose Activate this computer.

Need to free a slot? Click LICENSED twice inside the plugin, or deactivate the computer from your account.

It is at the bottom right of the plugin. If an update is ready, download it, finish the installer and restart your DAW.

On Windows, grab the latest installer from your account until signed updates are live.