(base) C:\Users\rock>conda search progressbar
Loading channels: done
# Name Version Build Channel
progressbar 2.2 py26_0 pkgs/free
progressbar 2.2 py27_0 pkgs/free
progressbar 2.3 py26_0 pkgs/free
progressbar 2.3 py27_0 pkgs/free
(base) C:\Users\rock>conda install -c pkgs/free progressbar=2.3=py27_0
Solving environment: failed
UnsatisfiableError: The following specifications were found to be in conflict:
- anaconda==2018.12=py37_0
- progressbar==2.3=py27_0
Use "conda info <package>" to see the dependencies for each package.