Install

Download a plug-in from its page, unpack the archive and copy the files to the plug-in folder for your system. Then rescan plug-ins in your host.

The plug-ins come as CLAP (a single .clap file) and VST3 (a .vst3 folder, copy the whole folder). Use whichever format your host prefers. Each download also contains an INSTALL.txt.

Linux

For your own user:

CLAP~/.clap/

VST3~/.vst3/

For all users, copy to the system folders instead (needs administrator rights):

CLAP/usr/lib/clap/

VST3/usr/lib/vst3/

If a folder does not exist, create it.

Windows

For your own user:

CLAP%LOCALAPPDATA%\Programs\Common\CLAP\

VST3%LOCALAPPDATA%\Programs\Common\VST3\

For all users (needs administrator rights):

CLAPC:\Program Files\Common Files\CLAP\

VST3C:\Program Files\Common Files\VST3\

Paste a path into the address bar of File Explorer to open it. If a folder does not exist, create it.

macOS

There is an experimental macOS test build of SubForge, and only SubForge for now. I have no Mac to build and test on, so it has had little testing. You can find it on the SubForge page. The other plug-ins have no macOS downloads.

Copy the unsigned build (or one you built yourself) to:

CLAP~/Library/Audio/Plug-Ins/CLAP/

VST3~/Library/Audio/Plug-Ins/VST3/

macOS builds are unsigned, so macOS puts a quarantine flag on them and refuses to load them. Remove the flag once in Terminal, then rescan plug-ins:

xattr -dr com.apple.quarantine ~/Library/Audio/Plug-Ins/CLAP/NAME.clapxattr -dr com.apple.quarantine ~/Library/Audio/Plug-Ins/VST3/NAME.vst3

Replace NAME with the plug-in's name, for example SubForge.

If the plug-in does not show up

Rescan plug-ins in your host, or restart it.
Check that the host looks in the folder you used, and that it supports the format you copied.
Copy the whole .vst3 folder, not only a file inside it.