I missed that "Ableton" word then
You shouldn't have any ANA.xxx plugin installed if you've installed the 64bit version, as mentioned before the correct plugin name is then A.N.A x64.vst & A.N.A x64.component for the respective .VST & .AU plugins.
Standard folder location still applies, unless you moved the plugin to a different folder ( i.e I put mine inside a Sonic Academy sub-folder ) but default install should result in the following installation paths :
YourMacOS_HDD/Library/Audio/Plug-Ins/VST --> A.N.A x64.VST
YourMacOS_HDD/Library/Audio/Plug-Ins/Components --> A.N.A x64.COMPONENT
Application files & presets are also stored into the following folder. Prior to delete your presets, make sure to back up your own user ones, you can always download & re-install purchase presets pack from your account but just make sure to backup any user presets before deleting the A.N.A folder.
YourMacOS_HDD/Library/Application Support/Sonic Academy/A.N.A
- Each path is refereing to the main MacOS Library, not the user library on Mac.
What I've also seen happening sometime is corrupted archive file or expanding them with archive manager apps that mess up with file permissions on MacOS. So after uninstalling ANA 1.5 and rebooting your Mac, make sure to get a fresh download of ANA 1.5 again from your S.A user account and to use a reliable archive manager app such as Keka or the integrated MacOS Archive Utility. Try the 64bit installation again then.
Open Ableton and Rescan your plugins, if it still the same and ANA 1.5 is not showing up and if you're sure to have the plugins been installed in their correct locations, then it could be a file permissions issue on MacOS or the plugin scan Database table entry that got corrupted. If it's at Live's level only, initializing Live should be sufficient, you can refer to this article from Ableton support :
If it's at the MacOS level, try first to repair permission on your HDD using the Disk Utility but it's likely that you will have to delete the MacOS plugin cache and enable a full plug-ins scan again, check the post N° 7 from this topic for that, the link should point you at the correct post.
Hope that helps, let us know if you're still having issue with this after trying the above solutions, if it can't be sorted out directly on the forums then you'll be able to put a support ticket with S.A but many times it's because of file permission or corrupted data that happen over time, so it's worth giving a try to the above solutions first.