Start from the project listing
Follow the official Clumps project link rather than searching only for a filename. Check the project's author information and open the details for the individual file you intend to install. This makes it easier to trace where a download came from.
Match the file to your instance
Compare the listed Minecraft version and loader with your launcher profile or server. Read release notes and dependency information before downloading. Save the original filename in your installation notes so you can identify it during future troubleshooting.
Keep the installation traceable
Place the jar in the active instance's mods folder while the game or server is stopped. Avoid renaming several different builds to the same generic filename. If a launcher manages downloads for you, use its installation history to record the change. After starting the instance, save any error output and confirm that you tested the same profile you intended to update.
Next step: read the installation guide or find a matching download.
Project reference: Official Clumps project and file details.