I’m not a computer code tech… A very smart friend of mine discovered this (see below).
You’ll notice the PLUG-IN ALLIANCE ADA FLANGER does not show “arm64” whereas the OVERLOUD (which I already owned) does:
PA VST Plugin
file ADA\ Flanger
ADA Flanger: Mach-O 64-bit bundle x86_64
TH-U: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit bundle x86_64] [arm64]
TH-U (for architecture x86_64): Mach-O 64-bit bundle x86_64
TH-U (for architecture arm64): Mach-O 64-bit bundle arm64