How do I install an older version of a library in Node-RED?

To install an older version of a library in Node-RED, you typically use the Node Package Manager (npm) command-line tool. Here’s how you can do it:

1. Open your Node-RED user directory: This directory usually contains your `package.json` file and `node_modules` directory. It is often located in your user's home directory under `.node-red`. You can find the exact location by checking your Node-RED settings.

2. Use the npm install command: Open your terminal or command prompt and navigate to your Node-RED user directory. Use the following command structure:

npm install <package-name>@<version>

Replace <package-name> with the name of the Node-RED library you want to install, and <version> with the specific version number you need. For example, to install version 1.0.0 of the `node-red-node-ping` library, you would use:

npm install node-red-node-ping@1.0.0

3. Restart Node-RED: After the installation is complete, you need to restart your Node-RED instance for the changes to take effect. You can do this through the Node-RED interface or via the command line, depending on how you are running Node-RED.

4. Verify Installation: Once Node-RED has restarted, check the Node-RED palette to ensure the older version of the library is correctly installed and functioning as expected. You can also check the installed version in the `node_modules` directory or by using the `npm list` command within your Node-RED user directory.

If you encounter any issues, make sure you have the correct permissions to install packages in your Node-RED user directory. Also, consider any compatibility issues between the older version of the library and your current Node-RED environment.

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