The latest release to run in your own environment is here, and the appropriate Nuget and npm packages are out there:
https://github.com/POPWorldMedia/POPForums/releases/tag/v18.0.0
Documentation for the open source project is still here:
https://popworldmedia.github.io/POPForums/
Remember, if you want the hosted version, go to the buy link above.
POP Forums: Hosted - Open Source
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