If you are installing WebViewer from npm, then you can install the nightly build using the major.minor-nightly tag.

For example, npm install @pdftron/webviewer@7.0-nightly will install the latest 7.0 nightly build from npm.

Visit https://www.npmjs.com/package/@pdftron/webviewer to see all the available versions and tags.

If you are getting the WebViewer library from Download then you can get the nightly builds from https://www.pdftron.com/nightly/#.

Multiple versions of WebViewer are available in stable and they are safe to use in production.

The next WebViewer version can be found in experimental, which is mostly used for trying out new features and is not considered to be stable.