Hello,

While it’s recommended that you install Ajenti on a fresh droplet, it will often work on an existing one. You can use this guide and it should work.

I would recommend backing up your data and taking a snapshot. I personally would even test on a snapshot. Make a 2nd droplet from a snapshot of your production server. Then install Ajenti on the new droplet to test. That way if anything breaks, you can figure it out on a test setup.

I tried this with a droplet I had a running LAMP stack and active site and it installed without any errors. While your results may vary, you should give it a try.