You’re probably using an ancient version of Mac OS, and things have moved forwards a bit since. The installers in modern Mac OS versions need to be signed with a certificate, and this apparently breaks backwards compatibility with older OS versions. This is why we provide a ZIP file for you to download and manually install in the following locations;

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Mac OS

Global system installation folder
/Library/Audio/Plug-Ins/Components
/Library/Audio/Plug-Ins/VST3

User installation folder
~/Library/Audio/Plug-Ins/Components
~/Library/Audio/Plug-Ins/VST3