How do I resolve the error "UnsatisfiableError" when using conda install?

When using the Anaconda installation process conda install gurobi to install Gurobi, you may receive an error such as:

UnsatisfiableError: The following specifications were found
to be incompatible with the existing python installation in your environment:

Specifications:
- gurobi -> python[version='2.7.*|3.5.*|>=2.7,<2.8.0a0|>=3.6,<3.7.0a0|>=3.7,<3.8.0a0|3.4.*']
Your python: python=3.8

When this happens, it indicates that your Python version is not compatible with the current Gurobi version. This generally means that your Anaconda installation is newer than the Gurobi package available via conda install. In this case, you can either:

1. Install an earlier version of Python in Anaconda, such as:

   conda install -c anaconda python=3.9

   then run conda install gurobi again, or
2. Check if the current Gurobi release is compatible with your version of Python. If so, follow the instructions for installing the full Gurobi Optimizer package in How do I install Gurobi for Python?

Further information

• Which Python versions are supported by Gurobi?
• How do I install Gurobi for Python?
• How do I update my Gurobi installation to a newer version?