Please note: Astra is only included with the Creator and Creator+ Splice plans.
Install Astra from the Splice desktop client. Restarting your machine may be required.
To get Astra up and running in Ableton you need to check Ableton's AU/VST settings.
Navigate to :
File and Folder(all Live versions until 10.1)/Plug-ins (Live 10.1 and later)
Make sure "Use AudioUnits/VST" are all checked and hit Rescan.
Windows users will only have the option "VST Plugin Custom Folder", manually navigate to the location you installed your plugin. By default the Windows installation path is:
C:\Program Files\Common Files\VST3\Splice\Astra