Installing qepcad within conda environment

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I have a conda environment with sage 10.4 installed in it. I tried sage -i qepcad but get the response, "unknown option: -i".

attempting a pip install, e.g. pip install sagemath-qepcad leads to no matching distribution being found.

Should I be using an older version of sage, or are there other suggestions for getting this to work without doing a global installation?

Thanks!