Facing Problem in installing latest version of qiime2-2020.8

i have qiime2-2020.6 version but i want to update 2020.8 in my macbook, when i am trying to upadte it it deny and showng this text.

Hi @SAMRENDRA01!

It looks like some of the packages downloaded are now corrupt. You can attempt to clean up the package cache by running:

conda clean --all

You might also need to remove the 2020.8 conda environment, first:

conda env remove -n 2020.8

Keep us posted!

:qiime2:

occurring the same problem after running the conda clean --all
conda env remove -n 2020.8. please find the image