You have a few choices, actually. If you are not attached to your current conda installation you can simply remove it and install ipyrad using the ipyrad installation instructions. Or, you can install a separate python2 miniconda installation altogether to use for ipyrad and any other Python2 code you want to run. Or, you can setup a separate Python2 environment in your existing conda installation. See the conda documentation for more tips on how to do that.