Please be sure that you're using a compatible DAW, and that you've installed the correct plugin format for your DAW.
Some DAWs may also require you to manually scan the plug-in folder in order for your plug-ins to appear. Please consult your DAW's documentation for more information about how to do that.
Antares plug-in installers will install in the following default locations on Mac and Windows:
Mac
AU
MacHD/Library/Audio/Plug-Ins/Components
AAX
MacHD/Library/Application Support/Avid/Audio/Plug-Ins/Antares Audio Technologies
RTAS/TDM
MacHD/Library/Application Support/Digidesign/Plug-Ins
VST2:
MacHD/Library/Audio/Plug-Ins/VST
VST3:
MacHD/Library/Audio/Plug-Ins/VST3 C:\Program Files\Common Files\AVID\Audio\Plug-Ins
Windows (64-bit DAW)
AAX (Pro Tools 11 or 12):
C:\Program Files\Common Files\AVID\Audio\Plug-Ins
VST3:
C:\Program Files\Common Files\VST3
VST2:
C:\Program Files\Common Files\VST2
Windows (32-bit DAW)
AAX (Pro Tools 10):
C:\Program Files (x86)\Common Files\AVID\Audio\Plug-Ins
RTAS/TDM (Pro Tools 10 or earlier):
C:\Program Files (x86)\Common Files\Digidesign\DAE\Plug-Ins
VST3:
C:\Program Files (x86)\Common Files\VST3
VST2:
C:\Program Files (x86)\Common Files\VST2