Hi I have this bug on Windows 10 :
I tried to execute cmd in administrator mode without success :
(yolact) C:\Users\Sylvain ARD>conda install cudatoolkit=10.0
Collecting package metadata (current_repodata.json): done
Solving environment: done


==> WARNING: A newer version of conda exists. <==
 current version: 4.8.3
 latest version: 4.9.2

Please update conda by running

   $ conda update -n base -c defaults conda



## Package Plan ##

 environment location: C:\Users\Sylvain ARD\.conda\envs\yolact

 added / updated specs:
   - cudatoolkit=10.0


The following NEW packages will be INSTALLED:

 cudatoolkit        conda-forge/win-64::cudatoolkit-10.0.130-h5327add_6


Proceed ([y]/n)? y

Preparing transaction: done
Verifying transaction: done
Executing transaction: done
ERROR conda.core.link:_execute(698): An error occurred while installing package 'conda-forge::cudatoolkit-10.0.130-h5327add_6'.
Rolling back transaction: done

LinkError: post-link script failed for package conda-forge::cudatoolkit-10.0.130-h5327add_6
location of failed script: C:\Users\Sylvain ARD\.conda\envs\yolact\Scripts\.cudatoolkit-post-link.bat
==> script messages <==
<None>
==> script output <==
stdout:
stderr: Accès refusé.

return code: 1

()


(yolact) C:\Users\Sylvain ARD>

“accès refusé” means “access denied” in french
thank you for help me
best regards