Enviroment from documentation not supported by the own documentation

[Sanrrone]

dears,
I created a metawrap enviroment with python 2.7 as the documentation suggest, but the are some dependencies that are not made for python 2.7 (like blast 2.6).

mamba install --only-deps -c ursky metawrap-mg

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              /  / \   / \   / \   / \  \____
             /  /   \_/   \_/   \_/   \    o \__,
            / _/                       \_____/  `
            |/
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        ╚═╝     ╚═╝╚═╝  ╚═╝╚═╝     ╚═╝╚═════╝ ╚═╝  ╚═╝

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Looking for: ['metawrap-mg']

conda-forge/linux-64                                        Using cache
conda-forge/noarch                                          Using cache
ursky/noarch                                                  No change
ursky/linux-64                                                No change

Pinned packages:
  - python 2.7.*


Could not solve for environment specs
The following packages are incompatible
└─ metawrap-mg   is uninstallable because there are no viable options
   ├─ metawrap-mg [0.8|0.8.2|...|1.0.3] would require
   │  └─ bcftools  , which does not exist (perhaps a missing channel);
   ├─ metawrap-mg [1.0.4|1.0.5|...|1.1.3] would require
   │  └─ kraken  , which does not exist (perhaps a missing channel);
   ├─ metawrap-mg [1.1.4|1.1.5|1.1.6|1.1.7] would require
   │  └─ pplacer 1.1.alpha17.* , which does not exist (perhaps a missing channel);
   └─ metawrap-mg [1.1.8|1.2|...|1.3.2] would require
      └─ blast 2.6.0.* , which does not exist (perhaps a missing channel).

what should I do in this case?
thanks you very much in advance