CondaUpgradeError: This environment has previously been operated on by a conda version that's newer
than the conda currently being used. A newer version of conda is required.
  target environment location: C:\Users\XXXXXXXXXX\AppData\Local\Continuum\anaconda3
  current conda version: 4.5.11
  minimum conda version: 4.6

Ok, vamos tentar algo estúpido ...

C:\Users\XXXXXXXX>pip install conda==4.6
Collecting conda==4.6
  Could not find a version that satisfies the requirement conda==4.6 (from versions: 3.0.6, 3.5.0, 3.7.0, 3.17.0, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.0.5, 4.0.7, 4.0.8, 4.0.9, 4.1.2, 4.1.6, 4.2.6, 4.2.7, 4.3.13, 4.3.16)
No matching distribution found for conda==4.6

Como saio dessa armadilha? Eu tentei atualizá-lo com vários comandos conda install e conda update, mas nada funciona. Aparentemente, isso aconteceu com a atualização de 4.6 para 4.6.2