Paradigm is available for the latest 20.0, 20.5, & 21.0 production builds of Houdini. Daily builds are not supported.
After downloading Paradigm, unzip the files. You will find a json file and a folder. This is the Houdini package. If you look inside the folder you will see each Houdini version and platform that is supported.

<aside> 💡 Paradigm packages have a version, revision, and build number associated with them. It is safe to install multiple versions and revisions together such as Paradigm 1.0, 1.1 & 1.2 however you can not have multiple builds of a particular version and revision installed at the same time such as Paradigm 1.0.120 & 1.0.145
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<aside> 💡 When a new production build is released by SideFX we will compile a new plug-in for that version. You will need to download and re-install Paradigm if you want it to work with the new Houdini build.
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Next you will need to move the json file and folder to your Houdini preference’s packages folder.
<aside> 💡 If the packages folder does not exist please create it.
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Your preferences folder can be found here on your OS.
Windows
C:\Users\USERNAME\Documents\houdini##\
macOS
/Users/USERNAME/Library/Preferences/houdini/##/
<aside> 💡 On macOS you may need to use Finder’s go to folder feature to get to this directory.
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Linux
/home/USERNAME/houdini##/
Now you can launch Houdini and search for the Paradigm nodes in SOPs.
